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Alternative therapy
Intravenous vitamin C
Supplements · Vitamins
Tier CUse with cautionRating: 25/100
Important
Do not replace or delay standard cancer treatment with unproven therapies. Always consult your oncology team before starting anything new.
Summary
High-dose IV vitamin C is promoted by some as a cancer therapy, but it is not a standard treatment.
Claims: Anti‑tumor, Supportive/adjunct
Evidence
Human trials have not shown clear clinical benefit in cancer outcomes; a phase II trial found no added benefit with docetaxel.
Negative/neutral evidence: No proven improvement in survival or tumor response has been demonstrated in controlled trials.
Human evidence exists but does not show clear benefit.
Safety & interactions
Discuss with oncology team; not standard of care.
Warnings
- • Not approved as a cancer treatment.
Sources
Last reviewed: 2/19/2026 · Rating methodology