Description of the potential effects of the substance "Vitamin C" based on the literature. (This is not a product description, disclaimer at the bottom of the page)

 

The medical community has turned its attention to intravenous vitamin C (sodium ascorbate) for its potential efficacy in treating viral infections, cancer and many forms of sepsis. It has been suggested that administration of high doses of IVC will preserve normal cellular function, while preferentially demonstrating a pro-oxidant effect on cancer cells. Additionally, recent clinical studies have looked at the effects on oxidative stress and inflammation, two major components of chronic disease physiology. (1) .

 

Table of contents

1. The role of intravenous vitamin C in modern medicine: A comprehensive review. 1
2. Intravenous dosage and administration of vitamin C according to different conditions:. 3
3. Recommended dosage based on studies of various conditions. 3
4. Historical outline of intravenous vitamin C (IVC) administration. 3
5. Early discovery of vitamin C... 4
6. Development of high-dose vitamin C therapy (1940s-1970s). 4
7. Renewed interest in IVC: 1990s - present. 4
8. Mechanism of action:. 4
9. Bioavailability and absorption: 4
10. The difference between oral and intravenous vitamin C: 5
11. Mechanism of action in the body: 5
12. Natural dietary sources or intravenous vitamin C. 6
13. Intake of vitamin C from natural food sources 6
14. Intravenous vitamin C (IVC). 6
15. Clinical and therapeutic applications of intravenous vitamin C in contemporary healthcare 7
16. Critical care and sepsis management. 7
17. Cancer therapy. 7
18. Wound healing and skin health. 8
19. Cardiovascular benefits. 8
20. Neurological disorders and cognitive health. 8
21. Strengthening the immune system. 8
22. Additional uses of intravenous vitamin C... 9
23. Sodium ascorbate - the best in intravenous therapy 9
24. Vitamin C given intravenously in sepsis and critical conditions. 9
25. Mechanism of action in sepsis and critical illness. 9
26. Clinical evidence supporting the intravenous use of vitamin C.... 10
27. Recommended dosage and method of administration. 10
28. Potential benefits in specific areas. 10
29. The role of vitamin C in liver health. 10
30. Potential benefits of IVC in inflammatory liver conditions. 11
31. Intravenous vitamin C in cardiovascular health:. 11
32. Effects on endothelial function and hypertension. 12
33. Reduction of oxidative stress in arteriosclerosis. 12
34. Protection against myocardial ischaemia-reperfusion injury. 12
35. Intravenous vitamin C in neurodegenerative diseases. 12
36. Antioxidant and anti-inflammatory effects in Alzheimer's disease. 12
37. Dopaminergic protection in Parkinson's disease. 12
38. Neuroimmune modulation in multiple sclerosis.... 13
39. Intravenous vitamin C in metabolic disorders. 13
40. Improving insulin sensitivity. 13
41. Reduction of inflammation and oxidative stress in diabetes. 13
42. IVC and obesity-related inflammation. 13
43. Intravenous vitamin C in sports medicine and recovery 14
44. Reduction of oxidative stress caused by exercise.... 14
45. Muscle regeneration and reduction of inflammation. 14
46. Effects on immune system function in athletes.... 14
47. Impact on resilience and performance. 15
48. Intravenous vitamin C and kidney disease. 15
49. Benefits of IVC in renal disease: 15
50. Potential benefits of intravenous vitamin C for students... 16
51. Final verdict: Is intravenous vitamin C safe? 16
52. Healthy persons: occasional use is probably safe but not necessary 16
53. People with pre-existing medical conditions: Caution should be exercised. 16
54. Summary:. 17
55. Disclaimer:. 18
56. References:. 18

Intravenous dosing and administration of vitamin C in depending on the various conditions:

Recommended dosage based on studies of various conditions

Cancer treatment:

High doses of IVC (sodium ascorbate) have been investigated as a potential anticancer drug. Studies have shown that plasma concentrations of approximately 14,000 μmol/l can be achieved after intravenous doses in the range of 50 to 100 grams. At these doses, vitamin C kills cancer cells in vitro (2)

The dosage range indicated in the Riordan IVC regimen is 0.1 to 1.0 g/kg body weight. The course of treatment usually starts with a 15-gram infusion and increases to 50-100 grams per session, administered repeatedly over the course of a week. A plasma vitamin C concentration in the range of 350-400 mg/dl (20 mM) is considered therapeutic (1) .

Sepsis:

IVC was administered to sepsis patients at a dose of 50 mg per kilogram of body weight at six-hour intervals in a randomised, controlled trial. The aim of this regimen was to assess the effect of high doses of vitamin C on patient outcomes. ( .3)

COVID-19:

During the COVID-19 pandemic, the use of high doses of IVC as a therapeutic option was investigated. In several experiments, doses of 12 grams were administered every 12 hours for seven days. However, meta-analyses and systematic reviews showed that vitamin C supplementation had no discernible effect on the severity of the condition (1) (2) .

Safety considerations:

Although IVC is usually well tolerated, several precautions should be taken:

• Check for glucose-6-phosphate dehydrogenase (G6PD) deficiency to stop haemolysis.
• Controlling renal function to prevent oxaliplatin nephropathy.
• Caring for the tumour lysis syndrome that can occur after intensive care (1) .

Historical outline of intravenous vitamin C (IVC) administration

Vitamin C has been used for medicinal purposes since the early 20th century. Two-time Nobel Prize winner Dr Linus Pauling promoted vitamin C in large doses as a preventive and therapeutic agent. Albert Szent-Györgyi, who was awarded the Nobel Prize for the discovery of vitamin C, studied its biochemical properties and possible medical applications in the 1940s. (3) .

Early discovery of vitamin C

The history of intravenous vitamin C (IVC) is closely linked to the discovery of vitamin C (ascorbic acid) itself.

In the 18th century, sailors suffering from scurvy (a disease caused by vitamin C deficiency) were treated with citrus fruits. British naval surgeon James Lind (1747) conducted one of the first clinical studies proving that citrus fruits could prevent scurvy. In 1931, Hungarian scientist Albert Szent-Györgyi isolated vitamin C from adrenal glands and later from peppers, leading to its structural identification. He was awarded the Nobel Prize in Physiology or Medicine in 1937 for his work. Shortly afterwards, Dr Charles Glen King (1932) independently isolated vitamin C from lemon juice. In the mid-20th century, scientists began to explore the potential of vitamin C beyond the prevention of deficiency diseases (4) (5) .

Development of high-dose vitamin C therapy (1940s-1970s)

In 1949, Dr Frederick R. Klenner, a North Carolina physician, was one of the first to use high-dose intravenous vitamin C to treat viral infections, including polio. His reports suggested that large doses could reduce the severity of disease. In the 1960s, Dr Linus Pauling, a two-time Nobel Prize winner, popularised the use of large doses of oral and intravenous vitamin C to boost immunity and prevent colds. In the 1970s, Dr Ewan Cameron and Linus Pauling conducted research into vitamin C as an adjunct to cancer therapy, claiming that it improved survival rates in terminal cancer patients. However, subsequent clinical trials conducted by the Mayo Clinic (1980) showed no significant benefit, leading to scepticism .(5)

Renewed interest in IVC: the 1990s - the present

The therapeutic potential of vitamin C resurfaced in the 1990s when Dr Mark Levine, a researcher at the National Institutes of Health (NIH), discovered that intravenous (IV) vitamin C produced significantly higher plasma concentrations than oral supplementation. Studies conducted between 2000 and 2010 looked at the use of intravenous vitamin C in the treatment of disorders related to oxidative stress, sepsis, cancer and viral infections. Due to its possible anti-inflammatory and immune-enhancing properties, IVC has been experimentally injected into seriously ill patients during the COVID-19 pandemic (2020-2022). (5) .

Mechanism of action:

Bioavailability and absorption:

SVCT1 and SVCT2, sodium-dependent vitamin C transporters, enable the absorption of vitamin C in the small intestine when it is administered orally. The bioavailability of oral vitamin C is dose-dependent, meaning that the efficiency of absorption decreases as the dose increases. Doses above 200 mg are mostly excreted in the urine and only a small percentage is absorbed. Intravenous administration of vitamin C can provide plasma concentrations significantly higher than oral therapy by overcoming this route of absorption (1) .

Intestinal transport systems interrupt the absorption of vitamin C when it is administered orally. On the other hand, intravenous dosing exceeds this limitation and achieves plasma concentrations higher than 10 mM .(6)

The difference between oral and intravenous vitamin C:

There is a maximum limit to the absorption of oral vitamin C; studies indicate that daily doses in excess of 1000 mg result in a decrease in plasma concentration. Conversely, vitamin C administered intravenously can result in plasma concentrations 30-70 times higher than that obtained orally. For this reason, intravenous vitamin C is particularly helpful in clinical settings requiring very high doses, such as cancer treatment or the treatment of sepsis (5) .

Mechanism of action in the body:

Vitamin C acts mainly as an antioxidant at lower doses. However, vitamin C can act as a pro-oxidant and produce hydrogen peroxide at higher doses, especially those that can be obtained by intravenous injection. Since many cancer cells are more susceptible to oxidative stress than healthy cells, this pro-oxidant effect may help to identify and eliminate cancer cells . (6)

When taken in large quantities, vitamin C exhibits several modes of action that support its therapeutic benefits, such as those listed below:

Pro-oxidant cytotoxicity of cancer cells:

The extracellular space produces hydrogen peroxide (H2O₂) when plasma vitamin C levels are high. By diffusing into cancer cells, this H₂O₂ overwhelms their antioxidant defences, causing necrosis or apoptosis induced by oxidative stress. On the other hand, normal cells can effectively neutralise H2O₂, reducing the possibility of damage to the (1) .

Inhibition of tumour growth and collagen synthesis:

Vitamin C is essential for the hydroxylation processes that stabilise collagen fibres and strengthen the extracellular matrix, which in turn inhibits tumour growth and promotes collagen synthesis. This structural integrity prevents tumour invasion and metastasis by limiting the migration of tumour cells .(1)

System modulation immune system:

IVC enhances immune function by promoting T-cell differentiation, increasing interferon production and stimulating the phagocytic activity of neutrophils and macrophages. Additionally, it reduces pro-inflammatory cytokines such as IL-6 and TNF-α, which are elevated in chronic diseases and cancer .(5)

Inhibition of angiogenesis:

Tumour growth requires the formation of new blood vessels (angiogenesis), a process mediated by vascular endothelial growth factor (VEGF). Vitamin C has been shown to downregulate VEGF expression and inhibit endothelial cell proliferation, reducing tumour vascularisation .(2)

Metabolic reprogramming in cancer cells:

The Warburg effect shows that glucose metabolism is altered in cancer cells. According to the study, vitamin C destroys hypoxia-inducible factor 1-alpha (HIF-1α), which slows down glycolysis and causes energy depletion and cancer cell death. (1) .

Hormonal and neurotransmitter support:

The natural production of serotonin, noradrenaline and dopamine is supported by vitamin C. Patients with chronic diseases may benefit from its role in neurotransmitter metabolism for mood management and improved cognitive function. (1) .

Natural dietary sources or intravenous vitamin C

An essential nutrient, vitamin C is well known for its immune-enhancing effects, its ability to protect against collagen formation and its involvement in many metabolic processes. Despite its abundance in natural dietary sources, intravenous vitamin C (IVC) has become more popular due to its rapid absorption and therapeutic potential. This section compares the absorption, bioavailability, physiological effects and clinical applications of dietary vitamin C and IVC.

Intake of vitamin C from natural food sources

Fruits and vegetables, such as oranges, strawberries, peppers and kiwis, contain vitamin C, which is absorbed in the gut by the sodium-dependent vitamin C transporter (SVCT1). Doses of 200-400 mg/day result in peak plasma concentrations, indicating the body's limited absorption capacity. The extra vitamin C is then excreted in the urine. Intestinal health, the presence of other nutrients and personal metabolic characteristics affect absorption efficiency (7) .

Intravenous vitamin C (IVC)

IVC distributes vitamin C directly into the bloodstream, bypassing the gastrointestinal tract and achieving plasma concentrations up to 70 times higher than those achieved by oral ingestion. Unlike dietary vitamin C, whose absorption is regulated by the gut, IVC causes a rapid and sustained increase in blood levels of vitamin C, enabling greater intracellular uptake in tissues. High plasma IVC levels may have pharmacological effects, such as increased antioxidant capacity and immune modulation, that are not achievable with oral intake of (8) .

Benefits of consuming vitamin C

Regular consumption of vitamin C-rich foods is associated with reduced oxidative stress, improved immune function and lower risk of cardiovascular disease and cancer. The presence of phytonutrients, fibre and bioactive compounds in whole foods enhances the synergistic effects of vitamin C, supporting overall health. Natural food sources are associated with better gut health and microbiome diversity, preventing long-term disease (9) . Consistent intake of vitamin C from fruit and vegetables strengthens immune defences by increasing white blood cell function and promoting antibody production. Whole foods provide additional antioxidants (flavonoids, carotenoids) that act synergistically with vitamin C to combat oxidative stress. In patients with severe infections or respiratory disease, high doses of IVC have been shown to reduce inflammation and shorten the duration of illness. Clinical studies suggest that IVC reduces levels of pro-inflammatory cytokines (IL-6, TNF-α) and improves immune cell function, particularly in viral pneumonia and sepsis (7) (10) .

Clinical and therapeutic applications of intravenous vitamin C in contemporary health care

Critical care and sepsis management

Sepsis, a life-threatening reaction to infection, leads to extensive inflammation, tissue damage and organ failure. In critically ill patients, vitamin C has shown promise in alleviating the harmful effects of sepsis. The efficacy of intravenous vitamin C in the treatment of sepsis has been the subject of several clinical trials. A notable study published in JAMA showed that intravenous administration of vitamin C, thiamine and hydrocortisone to sepsis patients improved their outcome by reducing mortality and improving organ function. Although more research is needed to confirm these findings, the study provided strong evidence indicating that vitamin C in high doses can help treat sepsis. (11) .

However, the results of other studies were contradictory. After analysing 15 studies on vitamin C in sepsis, a meta-analysis published in The Lancet concluded that although vitamin C may have some benefits, its overall effect on mortality is still unknown. More thorough, large-scale studies are needed to produce robust guidelines, as the evidence to date remains contradictory (1) .

Anticancer therapy

Vitamin C administered intravenously has aroused curiosity in relation to cancer because of its potential to increase the effectiveness of chemotherapy. According to research, by raising oxidative stress levels in cancer cells, vitamin C in high doses can improve the effects of chemotherapy. By reducing fatigue, discomfort and depression - common side effects of cancer and its treatment - intravenous vitamin C significantly improved the quality of life of patients with advanced cancer, according to a study published in Science Translational Medicine (1) (2) .

Furthermore, by stopping the proliferation of cancer cells and making them more susceptible to chemotherapeutic drugs, vitamin C in high doses can reduce the growth of several types of cancer, including pancreatic cancer, according to a study in Nature Reviews Cancer. Some studies have shown no discernible effect on cancer progression, while others have produced promising results. Based on a study published in JAMA Oncology, people with advanced solid tumours received intravenous vitamin C in addition to chemotherapy, and no improvement in survival rates was observed. These conflicting results highlight the need for additional research to determine the best dose, timing and patient groups that will benefit most from vitamin C therapy (1) .

Wound healing and health skins

In a separate randomised controlled trial, IVC supplementation accelerated postoperative wound healing in patients undergoing major surgery by enhancing fibroblast function and increasing collagen deposition. Research on diabetic ulcers and chronic wounds suggests that IVC can improve tissue repair and reduce the risk of infection by enhancing immune cell function and promoting angiogenesis (formation of new blood vessels).

Vitamin C and skin health

In addition to wound healing, vitamin C plays a key role in skin health and anti-ageing. UV radiation and environmental pollutants generate free radicals that accelerate skin ageing and damage. Because vitamin C counteracts these free radicals, the skin is protected from discolouration and premature ageing. Vitamin C promotes the synthesis of hyaluronic acid, which increases smoothness and elasticity and retains moisture in the skin. It inhibits tyrosinase, an enzyme that facilitates melanin formation, helping to minimise dark spots, discolouration and uneven skin tone. Studies indicate that by reducing pro-inflammatory cytokines, IVC can help alleviate inflammatory skin conditions such as rosacea, dermatitis and acne. (12) .

Cardiovascular benefits

Vitamin C has been documented to improve arterial stiffness, endothelial function and blood pressure in relation to cardiovascular health. The American Journal of Clinical Nutrition published a meta-analysis of 29 studies that showed that oral vitamin C supplementation was effective in lowering blood pressure in hypertensive patients. Currently, there are few studies on the use of intravenous vitamin C in heart disease, despite the moderate benefits that have been demonstrated with oral vitamin C. However, its antioxidant properties suggest that it may reduce oxidative damage to blood vessels and reduce the incidence of cardiovascular events. (1) .

Neurological disorders and cognitive health

One of the main triggers of neurodegenerative diseases such as Parkinson's and Alzheimer's is oxidative stress. Due to its strong antioxidant properties, vitamin C can help prevent cognitive decline. According to a study published in The Journal of Neurochemistry, vitamin C intake improved mental function in older people. However, additional research needs to be conducted to determine the usefulness of intravenous vitamin C in patients with neurological disorders, as its role in cognitive health is still under investigation. (1) (13) .

Strengthening the immune system

Vitamin C is widely believed to help strengthen the immune system. It increases the synthesis of white blood cells and improves the body's defence against infection. There is insufficient data on the ability of oral vitamin C to prevent or treat more serious illnesses, although it has been shown to reduce the intensity and duration of the common cold. According to the Cochrane Database of Systematic Reviews, colds can be shortened by vitamin C, but not prevented. There have been few studies on the benefits of intravenous vitamin C in boosting immunity, but because intravenous treatment produces higher doses, it may work better in critically ill patients (1) .

Additional uses of intravenous vitamin C

In pneumonia and viral infections such as COVID-19, IVC has been used to reduce inflammation and alter the immune response. Studies have shown that high doses of vitamin C can improve joint function and reduce inflammation in rheumatoid arthritis. Patients with chronic fatigue report feeling refreshed after IVC therapy (2) .

For a research-based article on intravenous vitamin C (IVC) therapy, the following technical details can be worked out:

Sodium ascorbate - the best in intravenous therapy

In the clinical setting, intravenous vitamin C - especially sodium ascorbate - is often administered for its therapeutic effects, which include immune support and antioxidant properties. In intravenous preparations, the optimal concentration is 1 g/10 ml of sodium ascorbate in sterile water (aqua). This concentration minimises the potential for venous irritation due to high osmolality, while ensuring that the infusion is sufficiently concentrated to produce the desired therapeutic effects. To maintain adequate concentration and prevent venous irritation, it is recommended to dilute sodium ascorbate in sterile water when the required dose reaches 20 g. Normal saline is a good choice for diluting doses below 20 g, as it is compatible with sodium ascorbate and reduces the possibility of negative reactions.

During high-dose vitamin C therapy, magnesium can also be infused to promote muscle relaxation and alleviate weight-related discomfort. This combination can help the infusion procedure run more smoothly, increasing the efficiency and comfort of the treatment.

Intravenous vitamin C in sepsis and critical conditions

Intravenous vitamin C has gained considerable attention in the context of sepsis and critical illness due to its potential to alleviate oxidative stress, support immune function and improve patient outcomes. Sepsis is a life-threatening condition that is often accompanied by systemic inflammation, organ dysfunction and tissue damage. Critical illness can further exacerbate these challenges, increasing the need for effective therapies. Below is a detailed explanation of intravenous vitamin C in this context, based on the results of the study .(11)

Mechanism of action in sepsis and critical illnesses

Vitamin C scavenges reactive oxygen species (ROS), which are elevated during sepsis and contribute to tissue damage, inflammation and organ dysfunction. It then helps to maintain the integrity of the endothelial cells lining the blood vessels. In sepsis, endothelial dysfunction leads to vascular leakage, hypotension and organ failure, and vitamin C helps to stabilise the vascular barrier. Vitamin C enhances both innate and adaptive immunity by supporting the function of neutrophils, macrophages and lymphocytes . In sepsis, an impaired immune response often leads to extensive infection and tissue damage. Vitamin C is essential for collagen synthesis, contributing to tissue repair, which is crucial for healing and recovery from critical illness .(14)

Clinical evidence supporting the intravenous use of vitamin C

Numerous studies have analysed the role of intravenous vitamin C in sepsis and critical illness, with mixed results. Several studies suggest that intravenous vitamin C can reduce mortality in critically ill patients by improving haemodynamic stability, reducing organ failure and modulating the inflammatory response. Vitamin C has also been shown to improve markers of organ function, such as serum lactate levels, and can potentially reduce the need for vasopressors, which are commonly used in septic shock to maintain blood pressure (15) . In addition, studies have shown that vitamin C supplementation can reduce levels of inflammatory markers such as C-reactive protein (CRP) and pro-inflammatory cytokines such as IL-6 and TNF-alpha, which are elevated during sepsis and critical illness. Some studies have shown that intravenous vitamin C can reduce the length of stay in the intensive care unit (ICU), possibly due to its effect on reducing the severity of sepsis and improving recovery time (16) .

Recommended dosage and method of administration

Different doses have been tested and investigated in studies to find the best protocol for intravenous vitamin C dosing in sepsis. In clinical trials, higher doses (e.g. 1-3 grams for 6 hours) have often been used. Most critically ill patients can safely receive high doses of vitamin C, although careful monitoring is recommended, especially for those with renal impairment or other contraindications (11) .

Potential benefits in specific areas

In septic shock, microvascular dysfunction can be restored to some extent by vitamin C. Its antioxidant properties improve circulation and stop capillary leakage by reducing oxidative endothelial damage. Vitamin C may help reduce oxidative damage to lung tissue in ARDS, which is common in critically ill patients. This may improve oxygenation and reduce mechanical ventilation time. By reducing oxidative stress and inflammation in kidney tissues, vitamin C has been shown to improve kidney function in patients with acute kidney injury, a common outcome of sepsis (11) .

The role of vitamin C in liver health

One important component of liver inflammation is vitamin C, a powerful antioxidant that helps to scavenge free radicals and reduce oxidative stress. Vitamin C, which is abundant in the liver, influences immune function, cleansing and collagen formation. Hepatitis, drug-induced liver injury (DILI) and non-alcoholic fatty liver disease (NAFLD) are conditions in which oxidative stress plays a role in liver damage. By reducing inflammation and lipid peroxidation, vitamin C can protect liver cells (hepatocytes) from damage (17) .

Potential benefits of IVC in inflammatory liver conditions

Reduction of oxidative stress and inflammation

The study showed that high-dose vitamin C reduces oxidative stress in the liver in patients with chronic liver disease. In a rat model, IVC administration significantly reduced levels of pro-inflammatory cytokines (TNF-α, IL-6), suggesting a protective role against liver inflammation.

Protection against non-alcoholic fatty liver disease (NAFLD)

NAFLD, characterised by excessive fat accumulation in the liver, is closely linked to oxidative stress. Studies have shown that vitamin C supplementation reduced liver fat accumulation and inflammation in patients with NAFLD. Another study showed that IVC could improve insulin sensitivity and liver enzyme levels (ALT, AST) in patients with NAFLD.

Support for liver detoxification and drug-induced liver injury (DILI)

The liver is the main detoxification organ, processing toxins and drugs. IVC was studied for its protective effect on acetaminophen-induced liver toxicity, a common cause of acute liver failure. The study showed that IVC reduces liver cell death and increases the production of glutathione, a key antioxidant in liver detoxification.

Potential adjuvant therapy in viral hepatitis

Chronic viral infections, such as hepatitis B and C, cause persistent hepatitis. A clinical trial suggests that high doses of IVC combined with antiviral therapy reduce liver enzyme levels and improve the immune response in patients with hepatitis C.

Pro-oxidant effects in high doses

On a physiological level, vitamin C is an antioxidant, but in very high doses it can act as a pro-oxidant, increasing the production of free radicals. Some studies suggest that excessive oxidative stress induced by IVC can potentially increase liver inflammation, rather than alleviate it.

Risks in patients with advanced liver disease (cirrhosis, liver failure)

Patients with cirrhosis may have altered vitamin C metabolism, making high doses potentially harmful. The study warned that in severe hepatic impairment, IVC may lead to oxalate accumulation, increasing the risk of hepatic stress and kidney stone formation.

Interactions with certain drugs

IVC may interact with chemotherapy drugs and anticoagulants, potentially affecting their metabolism in the liver. It may also affect liver enzyme activity, altering the clearance rate of the drug .(18)

Intravenous vitamin C in cardiovascular health:

Cardiovascular disease (CVD) is associated with oxidative stress, endothelial dysfunction and inflammation - all of which are potential targets for antioxidant therapy, including IVC.

Effects on endothelial function and hypertension

The endothelium plays a key role in regulating vascular tone through the release of nitric oxide (NO), which promotes vasodilation. A meta-analysis showed that vitamin C supplementation significantly improved endothelial function, especially in people with CVD risk factors such as hypertension and diabetes. The study showed that high doses of IVC increased vasodilation and arterial compliance in hypertensive patients, suggesting a potential benefit in blood pressure regulation.

Reduction of oxidative stress in arteriosclerosis

Oxidised low-density lipoproteins (LDL) contribute to atherosclerosis, leading to plaque formation and blood vessel damage. IVC reduced the levels of oxidised LDL and lipid peroxidation markers in patients with coronary artery disease on the basis of a research experiment. Furthermore, vitamin C has been shown to stabilise atherosclerotic plaques, reducing the risk of plaque rupture and thrombosis.

Protection against myocardial ischaemia-reperfusion injury

In ischaemia and reperfusion, injury occurs when blood supply is restored to the ischaemic tissues, leading to excessive production of reactive oxygen species (ROS) and inflammation. The current study showed that administration of IVC prior to coronary artery bypass surgery significantly reduced inflammatory markers (CRP, IL-6) and improved postoperative recovery .(19)

Intravenous vitamin C in neurodegenerative diseases

Degenerative neurological conditions such as multiple sclerosis (MS), Parkinson's disease (PD) and Alzheimer's disease (AD) are exacerbated by oxidative stress and inflammation. The neuroprotective benefits of IVC have been investigated.

Antioxidant and anti-inflammatory effects in Alzheimer's disease

The accumulation of beta-amyloid plaques and aggregation of tau protein in Alzheimer's disease generates oxidative damage, leading to neuronal death. The study showed that vitamin C administration reduces beta-amyloid-induced oxidative damage in neuronal cells. The study explains that high plasma levels of vitamin C were associated with better cognitive function in older people.

Dopaminergic protection in Parkinson's disease

PD is characterised by the loss of dopaminergic neurons in the black matter, leading to motor dysfunction. One study showed that IVC reduced oxidative stress-induced dopamine loss, suggesting a potential neuroprotective role. The study showed that IVC improves motor performance and reduces neuroinflammation in animal models of PD.

Neuroimmune modulation in multiple sclerosis

MS is an autoimmune disease characterised by chronic inflammation and demyelination of neurons. The study showed that IVC administration reduced neuroinflammatory cytokines (TNF-α, IL-1β) and improved myelin repair in MS patients .(20)

Intravenous vitamin C in metabolic disorders

Metabolic disorders, including type 2 diabetes mellitus (T2DM) and obesity, are characterised by chronic low-grade inflammation and insulin resistance. IVC has been investigated as a potential adjunctive therapy for the conditions listed below:

Improved insulin sensitivity

Studies have shown that IVC increases insulin-stimulated glucose uptake in diabetic patients, suggesting improved insulin sensitivity. Vitamin C may increase the expression and translocation of GLUT-4 transporters, which help move glucose into muscle cells for energy, lowering blood sugar levels. Hyperglycaemia induces reactive oxygen species (ROS), which impair insulin signalling. Vitamin C acts as a powerful antioxidant to counteract these effects. Chronic inflammation impairs insulin signalling, and vitamin C reduces IL-6 and TNF-α levels, helping to restore normal insulin function. Poor blood vessel health is common in diabetes, and IVC increases nitric oxide (NO) production, promoting better circulation and glucose delivery to tissues. A clinical trial showed that IVC lowered fasting blood glucose levels and improved HbA1c levels in patients with T2DM .(21)

Reducing inflammation and oxidative stress in diabetes

Hyperglycaemia leads to increased ROS production, contributing to diabetic complications. In this study, IVC was found to reduce oxidative stress markers (MDA, 8-OHdG) in diabetic patients, suggesting potential protection against diabetic nephropathy and retinopathy.

IVC and inflammation associated with obesity

Obesity is associated with chronic inflammation, with elevated levels of C-reactive protein (CRP) and IL-6. Adipose tissue is not only an energy reservoir, but also an active endocrine organ that secretes pro-inflammatory cytokines such as IL-6, CRP and TNF-α, which contribute to chronic inflammation and metabolic disorders. Increased oxidative stress in obesity leads to cell damage and mitochondrial dysfunction, exacerbating insulin resistance and metabolic disorders. The study showed that IVC supplementation significantly reduced systemic inflammation and improved fat metabolism in obese subjects .(22)

Intravenous vitamin C in sports medicine and recovery

The role of intravenous vitamin C (IVC) in sports medicine has gained attention for its antioxidant, anti-inflammatory and immunomodulatory properties. Athletes struggle with increased levels of oxidative stress, muscle damage and weakened immunity, especially after intense training or competition. Many studies have looked at how IVC can improve muscle recovery, reduce inflammation and improve immune function in athletes.

Reduction of oxidative stress induced by exercise

Reactive oxygen species (ROS), which are produced during high-intensity exercise, can lead to cell damage, delayed recovery and muscle exhaustion if not attended to. While some oxidative stress is beneficial for muscle adaptation, excessive ROS can impair performance. A study on endurance athletes showed that post-exercise administration of IVC significantly reduced markers of lipid peroxidation, indicating reduced oxidative stress. The role of antioxidants in exercise recovery was investigated and it was found that vitamin C supplementation, particularly IVC, helped to reduce malondialdehyde (MDA) and F2-isoprostane levels, which are markers of oxidative stress. The study showed that IVC helps maintain mitochondrial integrity in skeletal muscle, preserving ATP production and preventing fatigue during prolonged physical activity. The study suggested that IVC may promote mitochondrial biogenesis, leading to improved energy metabolism and endurance performance (23) .

Muscle regeneration and reduction of inflammation

Intense exercise induces muscle micro-injuries that cause inflammation and soreness. Vitamin C plays a key role in the synthesis of collagen, an essential component for the repair of muscles, tendons and ligaments. The study showed that IVC increases collagen synthesis and fibroblast activity, leading to faster healing of tendons and ligaments in athletes recovering from injuries. A similar study found that IVC reduces muscle soreness and creatine kinase (CK) levels, a biomarker of muscle damage, in resistance-trained individuals. Intense exercise triggers the release of inflammatory cytokines (IL-6, TNF-α, CRP), which contribute to muscle soreness and prolonged recovery time (8) . The study showed that post-exercise administration of IVC significantly reduced levels of C-reactive protein (CRP) and IL-6, markers of systemic inflammation. The study showed that vitamin C supplementation alleviated exercise-induced inflammation, improving muscle function and reducing post-exercise soreness (9) .

Impact on immune function in athletes

Heavy training can temporarily suppress the immune system, increasing the risk of upper respiratory tract infections (URTIs), particularly in endurance athletes. The study found that marathon runners who received IVC supplementation had fewer post-race respiratory infections compared to the placebo group. Studies have shown that IVC improves white blood cell (WBC) function by increasing the activity of neutrophils and lymphocytes, which are crucial for immune defence. Cortisol, a stress hormone, is elevated after prolonged exercise, leading to muscle breakdown and weakened immunity. In a study, IVC was shown to reduce post-exercise cortisol levels, leading to faster recovery and better immune defence in elite athletes (8) . The study showed that athletes who received IVC showed lower post-exercise cortisol levels and better T-cell function, suggesting a protective effect on immune homeostasis .(23)

Impact on durability and performance

VO2 max, a key indicator of aerobic capacity, determines an athlete's endurance capacity. Some studies suggest that IVC can increase oxygen utilisation and improve performance. In a double-blind, placebo-controlled study, IVC supplementation was shown to improve VO2 max and endurance performance in long-distance runners. The study showed that IVC administration increased oxygen transport and utilisation, improving time trial cycling performance. The study showed that athletes receiving IVC reported lower perceived exertion and shorter recovery time compared to those who received placebo (24) . The study observed that IVC administration improved lactate clearance, which helps to reduce muscle fatigue and prolong exercise capacity .(18)

Intravenous vitamin C and kidney disease

The likely benefits of intravenous vitamin C (IVC) therapy for several diseases, including kidney, have been investigated. Although some studies indicate that IVC may have a beneficial effect on renal function.

Benefits of IVC in renal disease:

Preclinical studies have shown that vitamin C can alleviate oxidative stress and inflammation, which are key contributors to AKI. For example, animal studies have shown that pretreatment with vitamin C significantly improved renal function, as evidenced by reduced plasma urea and creatinine levels. These findings suggest that the antioxidant properties of vitamin C may provide renal protection under conditions of acute injury (30).

The administration of high doses of intravenous vitamin C is associated with improved organ function, particularly of the lungs and kidneys, and reduced fluid requirements in critically ill sepsis patients. According to the study, administering high doses of intravenous vitamin C to patients with severe burns significantly reduced their fluid requirements and improved kidney function, suggesting that it may help maintain kidney health during critical illness (31).

A study published in the American Journal of Kidney Diseases analysed the response of haemodialysis patients to long-term, low-dose intravenous vitamin C supplementation. The study found that although intravenous vitamin C helped to correct deficiencies, it also raised plasma oxalate levels, which in turn caused calcium oxalate supersaturation. In such a scenario, kidney damage and kidney stone formation are more likely. The study highlights the importance of keeping an eye on oxalate levels in people with renal impairment receiving long-term vitamin C therapy (32).

Potential benefits of intravenous vitamin C for students

As students and schoolchildren often deal with high stress levels, irregular sleep schedules and exposure to disease, immune health is crucial. According to research, IVC can improve white blood cell activity and reduce the severity of viral infections, including the flu and the common cold. However, in healthy individuals, regular intake of vitamin C in the diet or supplements already provides adequate immune support. IVC can fight fatigue, increase mental clarity and promote overall wellbeing, according to several wellness clinics. According to one study, IVC helped people with chronic fatigue syndrome experience less oxidative stress and fatigue (25) . However, the effect of IVC on energy levels is still mainly anecdotal for healthy students, and the high cost may not be justified. The demands of academic life can lead to increased oxidative stress and cortisol levels, which can affect mental concentration and overall health. Research suggests that high doses of IVC can reduce cortisol levels and inflammatory markers, potentially benefiting students exposed to extreme stress. However, a balanced diet rich in antioxidants (e.g. citrus fruits, berries and leafy vegetables) may provide similar benefits at a fraction of the cost .(10)

Final verdict: Is intravenous vitamin C safe?

The safety of intravenous vitamin C depends on several factors, including dose, frequency of administration, individual health conditions and scientific evidence. Although it is generally safe for healthy individuals under controlled conditions, high doses may pose risks:

Healthy persons: occasional use is probably safe, but not necessary

Intravenous vitamin C is often advertised for its ability to boost immunity, fight fatigue and improve skin health. Although it temporarily raises blood levels of vitamin C much higher than oral intake, there is no strong evidence that this translates into long-term health benefits.

The human body strictly regulates vitamin C levels and any excess is excreted in the urine. This means that intravenous vitamin C administration may lead to a temporary increase in levels, but has no lasting benefit for people with normal vitamin C intake. No strong clinical evidence supports the claim that intravenous vitamin C improves long-term immune function, skin health or fatigue levels in healthy individuals

Occasional intravenous vitamin C therapy is unlikely to cause harm in healthy individuals, but is no better than a balanced diet in maintaining vitamin C levels .(19)

People with pre-existing medical conditions: Caution should be exercised

Some groups need to be cautious when considering intravenous administration of vitamin C due to potential side effects:

People with kidney disease

High doses of intravenous vitamin C can lead to oxalate accumulation, increasing the risk of kidney stones and even kidney failure in susceptible individuals. Patients with chronic kidney disease (CKD) are at particular risk and should avoid high-dose vitamin C therapy (20) .

People with glucose-6-phosphate dehydrogenase (G6PD) deficiency

Intravenous vitamin C can cause haemolysis (bursting of red blood cells) in people with G6PD deficiency, a genetic disorder affecting the stability of red blood cells. It is essential to screen for G6PD deficiency before administering high doses of intravenous vitamin C .(1)

People with haemochromatosis (excessive iron storage)

Vitamin C increases the absorption of iron, which can be harmful for people with haemochromatosis (a disorder that causes iron overload). Excess iron in the body can lead to organ damage, particularly to the liver and heart. People with kidney disease, G6PD deficiency or iron overload should avoid intravenous vitamin C unless prescribed and monitored by a doctor .(20)

Sepsis and critically ill patients

Some studies have suggested that intravenous vitamin C may help reduce inflammation and mortality in patients with sepsis, but recent clinical trials have not confirmed significant benefits. The World Health Organisation (WHO) does not currently recommend intravenous vitamin C as a standard treatment for sepsis .(27)

Cancer treatment

High-dose intravenous vitamin C has been investigated as a potential complementary anti-cancer therapy, particularly to reduce the side effects of chemotherapy. Some studies indicate that intravenous vitamin C can selectively kill cancer cells when used together with chemotherapy, but clinical trials have shown inconsistent results. The American Cancer Society states that intravenous vitamin C should not replace standard cancer treatments .(28)

Viral infections

During the COVID-19 pandemic, intravenous vitamin C was tested as a treatment to reduce inflammation and lung damage. Some studies have suggested moderate benefits in severely ill patients, but there is no conclusive evidence to support intravenous vitamin C as a mainstream treatment for viral infections. Although intravenous vitamin C is being investigated for serious illness, it is not a proven first-line treatment and should only be used under medical supervision .(27)

Summary

Intravenous vitamin C is a promising treatment option that can help treat a variety of diseases such as cancer, sepsis and chronic inflammation. It is a useful complementary treatment due to its ability to selectively target cancer cells, improve immune function and regulate oxidative stress. Large-scale randomised controlled trials are required to verify its full therapeutic potential and to establish standard treatment regimens, even though clinical trials and case reports have shown promising results. IVC continues to be of interest to researchers and clinicians as integrative medicine evolves. Doses of IVC in clinical trials vary widely, typically from 50 mg/kg to 100 grams per infusion, depending on the condition being treated. While some studies suggest potential benefits, particularly in cancer therapy, the efficacy and safety of high doses of IVC require further investigation in large-scale randomised controlled trials. Ongoing clinical trials continue to explore the role of vitamin C in critical care, particularly in sepsis and its complications. The potential of vitamin C as an inexpensive add-on therapy to improve outcomes in critically ill patients remains of great interest, with further research needed to refine dosing strategies and confirm long-term benefits. IVC appears to have potential benefits for vascular health, hypertension and ischaemia-reperfusion injury, but larger randomised controlled trials are needed to establish its clinical utility. IVC shows promise in improving insulin sensitivity, reducing oxidative stress and modulating inflammation in metabolic disorders, but further studies are needed to determine optimal dosing and long-term effects. Furthermore, IVC may play a role in reducing exercise-induced oxidative stress, improving muscle recovery and supporting immune function, making it a potential supplement for athletes and physically active individuals. Intravenous vitamin C can offer rapid immune and antioxidant benefits, but the high cost, inconvenience and lack of necessity make it an impractical choice for most students. Unless someone is suffering from a specific medical condition that requires high doses of vitamin C, the same benefits can be achieved through a well-balanced diet and inexpensive supplements. For students looking to improve immunity, energy and resistance to stress, focusing on nutritious meals, regular sleep and hydration is a much more balanced and cost-effective approach. Future research should focus on evaluating long-term efficacy, understanding patient-specific responses and optimising dosing schedules. Intravenous vitamin C has the potential to significantly improve patient care, bridging the gap between mainstream and alternative medicine.

Disclaimer

This article has been written for educational purposes and is intended to raise awareness of the substance under discussion. It is important to note that the article is about the substance in general - it is not a description of a specific product (chemical reagent). We do not suggest using chemical reagents on humans - this is prohibited by law. For a product to be used for treatment, it must be registered as a medicine. The information contained in the text is based on available scientific research and is not intended as medical advice or to promote self-medication. The reader should consult a qualified health professional for all health and treatment decisions.

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