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 currently take. it's just as important to talk to your doctor before starting on any new supplements while you're undergoing cancer treatment of any kind.
do i need to worry about taking supplements if i'm on chemotherapy?