I've been reading about DCA and that it's been effective for GBM (which my husband has). Does anyone else use it? Where do you get it from? I bought a bottle on amazon and when I showed to my husbands doctor he told me that it's not FDA approved and we have no idea of telling what's really in the bottle. My husband is now hesitant to take it, but I think he should be taking it .. i'm thinking of just mixing it in his daily smoothie and not telling him .. anyone have any insight?