Question 1

Can kisspeptin replace hCG as an IVF trigger?

Accepted Answer

It is being studied for this, using kisspeptin-54 rather than kisspeptin-10. In a study of 53 women undergoing IVF, a single SC injection of kisspeptin-54 induced egg maturation, and pregnancies resulted. In a phase 2 trial of 60 women at high risk of ovarian hyperstimulation syndrome (OHSS), no woman developed moderate, severe or critical OHSS. Kisspeptin is not approved as an IVF trigger.

Question 2

Does kisspeptin increase testosterone?

Accepted Answer

Acutely, yes, in men, by stimulating LH. In healthy men, a 90-minute kisspeptin-54 infusion raised mean testosterone from 21.7 to 24.9 nmol/L. A 22.5-hour KP-10 infusion raised it from 16.6 to 24.0 nmol/L. These were short physiological studies. There is no evidence that kisspeptin-10 is a safe or effective long-term testosterone treatment.

Question 3

Is kisspeptin-10 different from kisspeptin-54?

Accepted Answer

Kisspeptin-10 is the minimal C-terminal sequence with full intrinsic bioactivity at KISS1R. Kisspeptin-54 is the major circulating isoform in humans, with a measured plasma half-life of about 28 minutes. In a direct IV comparison in healthy men, the two produced similar gonadotropin responses at the doses tested. Most clinical studies (IVF triggering, hypothalamic amenorrhea) have used kisspeptin-54.

Question 4

Does kisspeptin affect women differently than men?

Accepted Answer

Yes. In healthy men, IV kisspeptin-10 raised LH and FSH at doses as low as 0.3–1.0 nmol/kg. In women in the follicular phase of the menstrual cycle, KP-10 did not change gonadotropins even at high IV, SC or infusion doses. In the preovulatory phase, a 10 nmol/kg IV bolus did raise LH and FSH. This sexual dimorphism matters for any therapeutic use.

Question 5

Could kisspeptin be used for hypothalamic amenorrhea?

Accepted Answer

This is under investigation, using kisspeptin-54. In women with hypothalamic amenorrhea, twice-daily KP-54 injections led to loss of response (tachyphylaxis), but twice-weekly injections for 8 weeks raised reproductive hormone levels compared with saline. No adverse effects were observed in that study. It remains experimental.

Question 6

Is kisspeptin safer than hCG for IVF triggering?

Accepted Answer

Not yet proven. In a phase 2 trial of 60 women at high risk of OHSS, kisspeptin-54 triggered oocyte maturation in 95%, and no woman developed moderate, severe or critical OHSS. That trial had no hCG comparison group, so it cannot show how kisspeptin compares directly with hCG. All of this work used kisspeptin-54, not kisspeptin-10.

Question 7

Does kisspeptin have metabolic effects?

Accepted Answer

Possibly. In 15 healthy men, kisspeptin infusion increased insulin secretion after an IV glucose load. Kisspeptin also increased glucose-stimulated insulin secretion from human islets and a human beta-cell line in vitro. It did not change gut hormones, appetite or food intake. The human data are early and come from small studies.

Origin / Manufacturer	Synthetic
Active Components	Kisspeptin-10 acetateMannitol (lyoprotectant)
Storage	Lyophilized: −20°C. Reconstituted: 2–8°C
Shelf Life	Lyophilized 12+ months; reconstituted 7–14 days refrigerated
Form Factor	Lyophilized powder (research vial)

Kisspeptin-10

Specifications

Clinical Evidence

Frequently Asked Questions

Sources & References

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