Full-length kisspeptin neuropeptide (research/investigational)
Metastin
The full-length kisspeptin form with longer duration of gonadotropin stimulation compared to KP-10 in studied settings.
- Evidence:
- Moderate human evidence
- Status:
- Investigational
- Reviewed:
- 2026-08-03
Also known as: KP-54, Metastin, Full-length kisspeptin
What is Metastin?
The full-length kisspeptin form with longer duration of gonadotropin stimulation compared to KP-10 in studied settings.
This profile is educational. It organizes publicly discussed research context for Metastin and related naming aliases — it is not a treatment guide.
Proposed mechanism
KISS1R activation with prolonged GnRH/LH signaling due to extended peptide structure and slower clearance.
Mechanism language on PepGuide describes how researchers discuss pathways. Proposed mechanisms can change as evidence evolves.
Current research notes
Human evidence grade: Moderate human evidence
Preclinical evidence grade: Strong human evidence
Kisspeptin-54 (metastin) was originally identified as a metastasis suppressor before reproductive roles were discovered. Human infusion studies show sustained LH elevation. Investigated for IVF oocyte maturation triggers. Human evidence is moderate for endocrine endpoints.
Key uncertainties
- Clinical adoption vs GnRH analogs
- Optimal clinical protocols in research settings
Research areas being studied
- IVF
- Hypogonadotropic hypogonadism
- Reproductive endocrinology
Being studied for a topic is not the same as proven benefit in that topic. Prefer primary literature for study design, endpoints, and limitations.
Safety & side-effect notes
Reported or discussed adverse effects
- Mild GI effects in some studies
Additional risks & considerations
- Hormonal overshoot in sensitive populations
- Limited approved products
Regulatory status
Investigational
Regulatory framing here is educational and can lag policy changes. Check official sources for current status.
Frequently asked questions
What is Metastin?
The full-length kisspeptin form with longer duration of gonadotropin stimulation compared to KP-10 in studied settings.
How does Metastin work (proposed mechanism)?
KISS1R activation with prolonged GnRH/LH signaling due to extended peptide structure and slower clearance.
What is Metastin being researched for?
Metastin has been discussed in research contexts including: IVF, Hypogonadotropic hypogonadism, Reproductive endocrinology.
What does current evidence say about Metastin?
Moderate human evidence. Kisspeptin-54 (metastin) was originally identified as a metastasis suppressor before reproductive roles were discovered. Human infusion studies show sustained LH elevation. Investigated for IVF oocyte maturation triggers. Human evidence is moderate for endocrine endpoints.
What safety considerations are noted for Metastin?
Reported or discussed considerations include: Mild GI effects in some studies; Hormonal overshoot in sensitive populations; Limited approved products. This is educational information, not medical advice.
References & sources
- Dhillo WS et al. (2007). Kisspeptin-54 triggers LH surges in women — J Clin Endocrinol Metab. Evidence type: human.
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Educational and research information only. PepGuide does not sell or prescribe peptides, diagnose conditions, or provide personalized medical advice. Evidence summaries may include early-stage, animal, or limited human research — none of that is a substitute for primary literature or clinician guidance.