Peptides are short chains of amino acids that act as signals in the body. A few, like GLP-1 medications, are FDA-approved and well studied. Many of the peptides people search for online are not, and most of what is known about them comes from animal and early human studies.
These articles explain what popular peptides and peptide stacks are, what the evidence suggests and where the unknowns are. They are for education only and are meant to help you have a more informed conversation with a provider.