I used to have daily supplements of turmeric, which never seemed to do me any harm (that I knew of anyway), but when I mentioned this to the (senior) pharmacist, in the advanced heart failure clinic at my hospital, she nearly "had kittens"!!! She told me to stop taking it immediately (unfortunately I'd not long spent a lot of money buying the stuff). Apparently, as mentioned above by HSSS, because I have an iron deficiency, I must not take anything that further absorbs/depletes the iron in my body. This offsets any positive health benefits that turmeric might have. There was no mention (and nor did I notice) any effects, positive or negative, on my blood sugar levels. Does anybody want a couple of spare, large bottles of turmeric?? ha ha ha! Cheers, DB1.