Peptides are short chains of amino acids that act as signaling molecules. Oligopeptides, a specific type, contain 2 to 20 amino acids. People use peptides to help with skin, joint, muscle, and immune health, depending on the sequence. Capsule or powder forms are common, and taking them on an empty stomach can improve absorption.
Cautions depend on the specific peptide. Some can interact with medications or are not safe for pregnant or nursing women.