I asked about supplements when I started chemo and my Onc said most were okay except large amounts of Vit C and A. He also had reservations about Glucosamine. I had some veg and fruit combination tablets too that he said not to take as they contained some sort of natural bacterias that he said might be an issue with low immunity levels. I am waiting for my bloods to come back as normal after finishing chemo, then I am going to start a good dose of Probiotics.