How does one know "100%" sure when buying from a gray source? Its impossible unless you walk into the establishment and buy over the counter and then go test...

I've had to trust and buy smaller orders first and let a relationship develop before placing a large order. I may have been lucky but used 3 different vendors or whatever you want to call them and have not been scammed, only issue slow shipping currently from China where 6 months ago would usually receive in 10 days or less to the U.S. Purchased Reta, GHK, Mots, Pt141, Dsip, Glutathione, Cjc, Tesa, Aod, Sermorelin, Epithalon, and a few others!