Is Antioxidant Combination (Vitamins C + E + Beta-Carotene) Safe with Letrozole?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Avoid combined high-dose antioxidant supplements during letrozole therapy. Do not take antioxidant cocktail products without explicit oncologist approval. Dietary intake of antioxidants from food is generally acceptable.
Why this interaction occurs
High-dose antioxidant combinations may protect cancer cells from reactive oxygen species-mediated apoptosis induced by letrozole's downstream hormonal effects. Clinical trials have raised concerns that antioxidant supplementation may attenuate chemotherapy and hormonal therapy efficacy.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 49,117 reports mentioning Letrozole. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Letrozole + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Antioxidant Combination (Vitamins C + E + Beta-Carotene) interactions → · All Letrozole interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.