HI Frankieluvscupcakes,
Yes I have heard about taking mushroom supps. especially the ones you mentioned being shiitake and maitake I didn't take them through chemo but do cook weekly now and add shiitake mushrooms to our food. Sorry I cant help you anymore on this I would strongly recommend that you tell your oncologist about any supplements you are thinking of taking espeically whilst doing chemo, get them to ok it prior to buying the stuff, also some supps can interfere with the effectiveness of chemo like for example St Johns Wort, so please tell your onc.
Love and light to you
sarahlouise xx