Evidence memo / Reproductive & endocrine

Kisspeptin-54

Also: KP-54 · Kp-54 · Metastin · Metastin 1-54 · KISS1 68-121

A KISS1-derived 54-amino-acid peptide with small monitored human endocrine-physiology studies, reproductive-research records, and substantial KISS1/KISS1R mechanism literature. The credible public read is reproductive-axis biomarker response with strong product-identity and claim-scope boundaries, not routine clinical utility or fertility guidance.

Early human signalEarly human signalInvestigationalSafety / regulatory watch

The verdict

Our read at a glance.

Whether exact Kisspeptin-54 / KP-54 / metastin 1-54 evidence supports any claim beyond monitored human endocrine physiology, reproductive-axis biomarker response, research-status context, and product-identity or safety watch.

The signal
This memo draws on 48 vetted references. Exact KP-54/metastin 1-54 studies support small monitored human reproductive-axis biomarker responses, especially gonadotropin and LH-related measures. Hypothalamic amenorrhea and congenital hypogonadotropic hypogonadism records support research/probe or biomarker context, while IVF-adjacent publications count only as monitored reproductive research and safety-observation context. Mechanistic, animal, tissue, receptor, and structure sources support plausibility and identity boundaries without proving clinical outcomes.
The unknown
Whether exact KP-54 can show reproducible clinical outcomes and acceptable safety in defined populations under modern evidence standards, whether biomarker responses translate into patient-relevant outcomes, and how future records will keep KP-54 separate from KP-10, analogs, comparator hormones, compounded products, research-use products, internet-market products, and broad fertility or wellness claims.
Our read
Real signal, narrow interpretation. The human endocrine signal for kisspeptin-54 is credible, but the evidence stays biomarker-heavy, context-dependent, and easy to overstate: a measured hormone response is not a clinical outcome. Exact KP-54 should not be read as a fertility, wellness, libido, metabolic, or broadly available product claim.

The mechanism

How it works.

Kisspeptin-54 is the full 54-amino-acid peptide cut from the KISS1 protein, the longer parent of the kisspeptin-10 fragment. It binds KISS1R on hypothalamic GnRH neurons and drives them to release GnRH, which makes the pituitary secrete LH and FSH and pushes downstream reproductive-hormone production. Human studies in healthy volunteers and several reproductive conditions show this LH and FSH response, but the data are small, closely monitored, and track hormone markers rather than proven fertility outcomes.

Safety & regulatory boundary

The consequential part.

No exact FDA finished-drug record was identified in DailyMed/openFDA checks on 2026-05-17, which is a date-limited status note rather than an approval, ban, or global-status claim. Studied KP-54/metastin 1-54 records do not validate KP-10, MVT-602, TAK-style analogs, GnRH or gonadorelin, hCG, oxytocin, PT-141, compounded products, research-use products, internet-market products, or identity-uncertain products. Safety evidence comes mainly from small selected monitored research settings, not broad post-market exposure.

What's next

What we're watching.

Watch exact ClinicalTrials.gov status changes, peer-reviewed human studies with clinical endpoints, safety reporting, product-identity documentation, regulator or label records, and source maps that keep KP-54 separate from KP-10, KISS1R analogs, comparator hormones, IVF-adjacent research narratives, and market-product claims.

Context

Why this is discussed.

Kisspeptin-54 is discussed because it sits upstream of GnRH and reproductive-axis hormone signaling, and because published human research includes healthy-volunteer physiology, hypothalamic amenorrhea, congenital hypogonadotropic hypogonadism, PCOS, metabolic physiology, and IVF-adjacent research. That attention often blurs exact KP-54 with Kisspeptin-10, KISS1R agonist analogs, GnRH or gonadorelin, hCG, oxytocin, PT-141, broad fertility narratives, compounded products, research-use products, and internet-market products.

The evidence base

48 cited references.

Regulatory & labels1

FDA UNII substance record: KISSPEPTIN

Food and Drug Administration / GSRS · Checked 2026-05-17

Registered trials2

ClinicalTrials.gov: NCT01667406 KP-54 reproductive research registry

ClinicalTrials.gov · Status checked 2026-05-17

Indexed literature (PubMed)39

Kisspeptin clinical-status systematic review

Current Medicinal Chemistry · 2025

Kisspeptin source map in reproductive medicine

Frontiers in Endocrinology · 2022

Kisspeptin oocyte-maturation research review

Gynecological Endocrinology · 2017

Kisspeptin reproductive-neuroendocrine review

Seminars in Reproductive Medicine · 2019

Kisspeptin human-reproduction source-map review

Human Reproduction Update · 2014

Kisspeptin pathway and physiology review

Cellular Physiology and Biochemistry · 2018

Kisspeptin reproductive-endocrinology review

Journal of Endocrinology · 2016

Kisspeptin neuroendocrine source-map review

Journal of Neuroendocrinology · 2022

Kisspeptin neuroendocrinology review

Frontiers in Neuroendocrinology · 2022

Kisspeptin molecular-endocrinology source-map review

Journal of Molecular Endocrinology · 2025

Kisspeptin clinical-endocrinology review

Best Practice & Research Clinical Endocrinology & Metabolism · 2018

Kisspeptin endocrine-pathway review

Endocrinology and Metabolism · 2015

Sponsor & other sources4

PubChem compound record: Kisspeptin / metastin

NCBI / PubChem · Checked 2026-05-17

IUPHAR/BPS Guide to Pharmacology: Kisspeptin-54 ligand

IUPHAR/BPS Guide to Pharmacology · Checked 2026-05-17

IUPHAR/BPS Guide to Pharmacology: Kisspeptin receptor family

IUPHAR/BPS Guide to Pharmacology · Checked 2026-05-17

IUPHAR/BPS Guide to Pharmacology: radiolabeled Kisspeptin-54 ligand

IUPHAR/BPS Guide to Pharmacology · Checked 2026-05-17

Keep reading

Related published memos.