Barbara - It all comes down to know and trust your source. I buy spices only from established sellers. When it come to turmeric, mine comes from our local food co-op who diligently vet their distributors. I could go right down the block and buy from the Asian market a lot cheaper, but I don't know where their stuff comes from nor whether it is pure turmeric.

That said, in my humble opinion, turmeric tea made from powder is yukky and unpleasant to drink. The Japanese make theirs with dried turmeric root (much like you make ginger tea from ginger root) that might be better. Or you can buy turmeric tea already in tea bags from a number of providers of herbal teas.

So, d you trust the source? Try it! If not mybe try the root or a commercial tea?