Cancer Advisor

Quick Answer The supplements with the strongest human research behind them are vitamin D3 (paired with K2 and magnesium) , curcumin , omega-3 fatty acids , and green tea EGCG — each backed by multiple randomized controlled trials or meta-analyses, though results are mixed rather than uniformly positive. Melatonin looked promising in older, smaller trials, but the largest randomized trial to date found no overall survival benefit. No supplement replaces conventional cancer treatment, and a few — high-dose beta-carotene, vitamin E, and high-dose B6/B12 — have been linked to increased cancer risk in specific groups. Antioxidant supplements are generally discouraged during chemotherapy or radiotherapy unless a doctor directs otherwise. This is an educational overview, not personal medical advice — always loop in your oncology team before starting anything new. Disclosure: Some links in this article are affiliate links (including The Wellness Company and Amazon Associates). If ...

A 2026 Evidence-Graded Guide to Nutrition, Deficiency Correction, Muscle Preservation, Side Effects and Drug–Supplement Interactions Last reviewed: October 3, 2026 OneDayMD Bottom Line If I were receiving chemotherapy, I would not automatically take a large supplement stack . I would first protect adequate calories and protein, review the exact chemotherapy regimen, test for clinically important deficiencies, replace documented deficiencies, and add only selected supportive supplements when the evidence and safety profile justified doing so. The central question would not be “Which supplements kill cancer?” It would be: “What can help me stay nourished and functional without interfering with my cancer treatment?” Important: This is an evidence review and decision framework, not an individualized chemotherapy or supplement prescription. Chemotherapy regimens differ substantially. A supplement that is appropriate for one regimen can be in...