Unfortunately, we really don't know for 100 percent sure. That's one of EBAY's policies; you are taking the seller at their word. I personally do not buy hair care products , or designer purses, etc... online because you really don't know if you are getting authentic products. People can fake anything these days. even so called "certificate of authenticity". When it comes to my hair, I only buy my products from a professionsl salon. I use all Aveda, and I purchase from the salon only.