Do a search on the internet-it is the only way I could find it. Buy a giant bag, because it stays and it is a fortune for shipping. We got it from a vendor through Amazon.com and Amazon guarantees the authenticity (I think). Anyway, be sure to get FOOD GRADE-it is not the stuff at the pool store. Oh, and people say to put it on floors then vacuum it up in a few days. I had some nightmare trying to get it off of my floors! It broke our vacuum-don't bother. I have been taking it for the parasite problem (mystery) 3x a day in water w/crystal light and I feel much better. My problem, however, is nowhere near done. I am going to try a raw coconut cleanse and using coconut oil (not hydrogenated??) Make sure it is pure and unprocessed. Let me know how you do. Good Luck.