Is it okay to take maitake mushrooms extract during chemotherapy?

Maitake: In 2009, a phase i/ii human trial, conducted by memorial sloan–kettering cancer center, showed maitake could stimulate the immune systems of breast cancer patients. Then it might be considered safe so far.

PROBABLY NOT: It is better not to take this supplement during chemotherapy since it is not know if it interacts with your chemotherapy (ei: increase toxicity or decrease efficacy). I understand the reason you are taking mitake - for its "anti-cancer" properties. We don't have sufficient data to recommend the use of mitake as treatment. Best thing is to talk to your oncologist and inform him of the supplements.