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At pharmacological doses delivered intravenously, vitamin C acts as a pro-oxidant rather than antioxidant — generating hydrogen peroxide selectively in tumor microenvironments while supporting immune function, collagen synthesis, and antiviral defense through multiple mechanisms.
High-dose IV vitamin C is not available commercially in therapeutic concentrations. Compounding pharmacies prepare sterile sodium ascorbate solutions in concentrations of 500mg/mL and above — the only source for IV vitamin C at doses used in integrative medicine (10–100g infusions).
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Vitamin C (ascorbic acid) at high intravenous doses behaves pharmacologically differently from oral supplementation. While oral vitamin C is tightly regulated by intestinal absorption, IV administration bypasses this ceiling — achieving plasma concentrations 30–70 times higher than oral dosing.
At these pharmacological plasma levels, vitamin C transitions from an antioxidant to a pro-oxidant in certain environments, particularly in tumor microenvironments where it generates hydrogen peroxide selectively toxic to cancer cells while sparing normal tissue.
High-dose IV vitamin C is used in integrative oncology (as adjunct to conventional cancer treatment), for severe viral illness recovery, immune optimization, adrenal fatigue, and general antioxidant/anti-inflammatory protocols.
Pro-oxidant Activity (High Dose)
At plasma concentrations above 1mM (achievable only via IV), ascorbate donates electrons to metal ions generating hydrogen peroxide in extracellular fluid — selectively toxic to cancer cells that lack catalase to neutralize it.
Collagen Synthesis
Vitamin C is essential for hydroxylation of proline and lysine in collagen — supporting wound healing, tissue repair, and connective tissue integrity.
Immune Enhancement
Vitamin C stimulates neutrophil function, NK cell activity, and interferon production — enhancing innate and adaptive immune responses particularly relevant during infection.
Antioxidant Recycling
Vitamin C regenerates oxidized vitamin E and glutathione, amplifying the body's overall antioxidant network.
Integrative Oncology: Adjunct to chemotherapy and radiation — reduces side effects, may enhance tumor response
Immune Support: Severe infections, post-viral recovery, Long COVID
Anti-aging / Longevity: Oxidative stress reduction, collagen support, cellular protection
Adrenal Support: Adrenal cortex has highest vitamin C concentration of any tissue — supports cortisol synthesis
General IV Nutrient Therapy: Often combined with B vitamins, magnesium, and glutathione in Myers cocktail protocols
Immune / general wellness: 10–25g IV over 60–90 minutes
Integrative oncology: 25–100g IV over 2–4 hours, 1–3x per week per protocol
IM / SubQ (lower doses): 1–5g for maintenance between IV sessions
G6PD deficiency must be screened before high-dose IV vitamin C — hemolysis risk. Kidney stone history requires caution at very high doses.
During infusion:
High dose risks:
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