Do I need to worry about taking supplements if I'm on chemotherapy?
David Kiefer, MD
Family Medicine, WebMD Medical Expert
University of Arizona, Tucson
Vitamins, minerals, and herbal supplements may interact with chemotherapy drugs or radiation treatments, blocking their effectiveness. There's even some reason to worry that antioxidant supplements may protect cancer cells, although it is controversial. Still, it's very important for you to tell your doctor about any supplements that you take. It's just as important to talk to your doctor before starting any new supplements while you're undergoing cancer treatment of any kind.