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Peptides are molecules made from amino acids. Their properties depend on composition, sequence and structure, rather than simply on the name of their class.
The structure of a peptide
Amino acids can join together through peptide bonds to form a chain. Their order matters: two chains of equal length do not necessarily have the same properties. The terms “peptide” and “protein” are related, but a rigid rule based on the number of units does not account for every case.
Why there is no single effect
The term “peptides” covers substances with very different functions. Some are studied as signalling molecules, others as cosmetic ingredients. Evidence for a particular substance, dose and route of administration does not establish the effectiveness of the entire class.
Where to begin
Write down the substance's exact name. Then establish whether you are reading about an ingredient, a finished cosmetic product or a medicine. Look for a link to the original study, a description of its participants and its limitations. This will help you prepare questions for a professional.
Sources
- IUPAC Gold Book — PeptidesTerminology
A registry link lets you find studies; it does not confirm effectiveness. Learn more about our approach to sources.
