Here are some of the supplements/vitamins  you should avoid: glucose, glutamine, iron and copper. Pay special attention to multi-vitamins that contain copper and iron. Glucose, glutamine, Iron, and copper all drive cancer growth. Other supplements need to be avoided based on the type of cancer you have and the treatment(s) you are on. Before taking supplements, consult with an experienced integrative oncology or functional oncology provider who can prescribe supplements based on cancer supported research related to your specific treatment and type of cancer.