Why it is done this way
A category with real evidence and a great deal of overstatement
Some peptides have solid evidence for specific uses. Others have very little beyond enthusiasm.
Peptides are short chains of amino acids that act as signals. Insulin is one. So is the GLP-1 class now used for weight.
We will tell you which have evidence behind them for your situation, and we will not start you on something because it is fashionable.