The peptide library
Every major peptide with a Peptiblox Score: how strong the human evidence is, where it stands with the FDA, and the legitimate way to access it. Add the ones you are curious about to your stack and bring it to a licensed provider.
Scores reviewed October 1, 2026
The 5-second version
What is a peptide, really?
- 1
Amino acids are the blocks
Your body uses 20 kinds of amino acids. Think of each one as a building block.
- 2
A short chain is a peptide
Link 2 to about 50 of them and you get a peptide. Semaglutide is 31 blocks long; BPC-157 is 15.
- 3
It fits a receptor, like a key
The chain's shape matches a receptor on your cells and switches a signal on, such as "I'm full."