Endogenous Peptide
Definition
A peptide produced within an organism, rather than supplied from an external source.
By PurePeptideHub Editorial Team · Updated . Educational source review; independent clinical review pending.
Origin and exposure are different
Endogenous describes where a molecule comes from. The body may produce a peptide in a particular tissue, release it at a particular time and regulate its concentration. Giving a similar molecule from outside the body creates an exposure that need not reproduce that pattern.
References: [1]
A concrete example
POMC is a precursor protein that cells process into smaller peptides with distinct functions. This illustrates why the precursor, the released peptide and a manufactured analog should be identified separately. A product described as natural does not tell the reader which of these it contains.
Common misconception
A molecule’s presence in normal physiology does not establish the safety of additional exposure, a different delivery route or a modified sequence. For a research claim, record the exact molecule, source and measured concentration instead of treating endogenous as a quality certification.