What are peptides?
Peptides are short chains of amino acids that act as signals in the body.
A peptide is a short chain of amino acids joined by peptide bonds. The same bonds build proteins; the difference is mostly length. Chains up to roughly 50 amino acids are usually called peptides, while longer, folded chains are proteins.
Many of the body's own signalling molecules are peptides — including hormones like insulin and GLP-1. Because they act as precise biological signals, synthetic peptides are studied as research tools and, in some cases, developed into approved drugs.
Crucially, 'peptide' is a chemical category, not a safety category. Some peptides are approved medicines with extensive human data; many others are research compounds with little or no human evidence.
Educational and research reference only. Not medical advice.