When I first started I bought a 60mg kit of Tirz from Cantydes on sale. Only later did I learn more and see all of the negative remarks. I'm embarrassed that I didn't learn more before I made the purchase. I finally had the nerve to send it out for testing. I just got the COA back from TrustPointe (Peptidetest.com). 60.56mg mass and 99.389% pure. I'm relieved and happy that I got what I paid for.