Kisspeptin (K-10), what the science actually shows

Kisspeptin is a neuropeptide that stimulates gonadotropin-releasing hormone (GnRH) secretion, studied for reproductive hormone signaling. Not FDA-approved. Evidence base: multiple human studies on reproductive hormone signaling.

A neuropeptide upstream of the entire reproductive hormone cascade. It tells the brain when to release GnRH. Multiple variants exist (K-10, K-54, K-13). Research spans PCOS, hypogonadism, and IVF timing.

Evidence
★★★☆☆ Moderate
Type
Neuropeptide
Structure
10-54 amino acids (variants)

What kisspeptin is

Kisspeptin is a family of neuropeptides encoded by the KISS1 gene. The full-length form is kisspeptin-54 (metastin), cleaved into shorter active fragments: K-14, K-13, and K-10. All bind the same receptor (KISS1R). K-10 is most commonly used in research, full receptor activity, shortest sequence. Named after Hershey, PA (Hershey's Kisses) where the gene was discovered.

Mechanism, in plain English

Kisspeptin neurons in the hypothalamus act as the master switch for reproductive hormone release. When kisspeptin binds KISS1R on GnRH neurons, it triggers GnRH secretion, which signals the pituitary to release LH and FSH. LH drives testosterone in males and ovulation in females. This makes kisspeptin the upstream regulator of the entire HPG axis.

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What the evidence shows

Human studies show kisspeptin-54 infusion potently stimulates LH and testosterone. In women with hypothalamic amenorrhea, it restored pulsatile LH secretion. IVF research shows kisspeptin can trigger oocyte maturation with lower OHSS risk than hCG. In PCOS, kisspeptin dynamics are altered and exogenous kisspeptin may help normalize the LH:FSH ratio.

FDA status

Not FDA-approved. Active clinical research in IVF, hypogonadism, and reproductive endocrinology.

Common synonyms

Kisspeptin-10, Kisspeptin-54, Metastin, KISS1 peptide, KP-10, KP-54

Safety and adverse-event landscape

Clinical trials report kisspeptin is well-tolerated. Transient flushing and mild injection site reactions are the most common side effects. No serious adverse events in published trials.

Frequently asked questions

K-54 is full-length (54 amino acids) with longer half-life. K-10 is the minimum active fragment (last 10 amino acids) retaining full receptor binding.
In clinical studies, kisspeptin infusion acutely increases LH and testosterone in men. Whether chronic administration maintains this without receptor desensitization is under investigation.
Yes, K-54 is being researched as a safer alternative to hCG for triggering oocyte maturation with lower OHSS risk.
No. Peptexa is educational only.

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