The “-10” simply counts the amino acids: Kisspeptin-10 is a ten-residue peptide.

“Kisspeptin” is the name given to the family of peptides encoded by the KISS1 gene. The gene was named with a nod to Hershey, Pennsylvania, where it was first characterized, and to the town’s Hershey’s Kisses. The full-length peptide is often called metastin. Kisspeptin-10 is the short C-terminal piece of that larger molecule.

Kisspeptin-10 is a short linear peptide — a single chain of ten amino acids joined by peptide bonds, with no disulfide bridge or ring.

The commonly reported sequence is Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH2. The final Arg-Phe-NH2 motif is the part recognized by the receptor, which is why this short fragment can still activate its target receptor-style signaling much like the full peptide.

Kisspeptin did not start life as a reproductive hormone in the lab notebooks — it started as a cancer gene.

KISS1 was identified in the mid-1990s as a metastasis-suppressor gene: cells expressing it were less able to spread. Only later did researchers discover that the peptide it encodes binds a receptor then called GPR54 (now KISS1R), and that this signaling is essential for triggering puberty and driving the reproductive hormone axis. The ten-residue fragment was studied because it preserved receptor activity in a smaller, easier-to-handle molecule.

The logic was to isolate the smallest piece of kisspeptin that still “works” at the receptor.

Large peptides are harder to synthesize, characterize and study. Once the C-terminal region was found to carry the receptor-activating information, a ten-residue fragment became a practical research tool for probing how kisspeptin signaling controls the release of gonadotropin-releasing hormone (GnRH) and, downstream, luteinizing hormone. It is used to ask mechanistic questions about that pathway, not as a finished therapeutic.

Kisspeptin-10 is a genuine chain-peptide, so it is built by solid-phase peptide synthesis (SPPS).

In SPPS the chain is assembled one amino acid at a time on a solid resin, with protecting groups added and removed at each step; the C-terminal amide is introduced using an appropriate resin/linker. After assembly the peptide is cleaved, deprotected and purified, typically by reverse-phase HPLC, with identity confirmed by mass spectrometry. This is the same general method used for other short research peptides.

Kisspeptin signaling is a well-established part of reproductive biology; Kisspeptin-10 specifically is primarily a research and physiology tool.

There is a substantial peer-reviewed literature on kisspeptin and KISS1R in the control of GnRH and the reproductive axis, and human physiology studies have used kisspeptin peptides experimentally. However, this material is offered strictly for research use only. It is not a drug, its safety and effectiveness for any use in individuals are not established here, and nothing on this page is medical advice or a protocol. Questions about human use belong with a qualified physician and, where relevant, the published clinical-trial record at the sources we cite.