This is my go to site for all things peptides. When I started I was using peptides sciences; which I great brand with a lot of available research, but also very significant cost increase. Once I started with certified peptides I got the same results for a considerably lower dollar value. Customer service has been amazing and the weekly deals have saved me a ton of money! I have used for GLPs, bp 157, cjc, ipamoralin ands NADs. Highly recommend Cert Peptides!