Common Dosage
Research dependent (typically 1-10mcg/kg IV)
Category
Hormonal
- Hormone regulation
- Fertility support
- Testosterone optimization
- Puberty research
Kisspeptin (originally called metastin) was first identified in 1996 as a metastasis suppressor protein. Its role as the master regulator of the hypothalamic-pituitary-gonadal (HPG) axis was discovered in 2003 when researchers found that loss-of-function mutations in the kisspeptin receptor (KISS1R) caused hypogonadotropic hypogonadism. This finding established kisspeptin as the upstream 'gatekeeper' of puberty and reproductive function — a breakthrough in reproductive endocrinology. Human clinical research has since extensively characterized its role in fertility, testosterone optimization, and sexual function.
Kisspeptin neurons in the hypothalamus (arcuate and anteroventral periventricular nuclei) release kisspeptin, which stimulates GnRH neurons via KISS1R. GnRH then triggers pulsatile LH and FSH release from the pituitary. LH drives testosterone production in Leydig cells (men) and estradiol/progesterone in the follicle (women). This cascade means kisspeptin sits at the very top of the reproductive hormone axis — controlling the entire downstream hormonal pattern.
- Hypogonadotropic hypogonadism — established mechanism
- Male hypogonadism and testosterone restoration
- Female fertility and ovulation induction research
- Hypothalamic amenorrhea (absence of periods from hypothalamic dysfunction)
- Sexual desire and arousal research
- Puberty regulation and timing
Testosterone Stimulation in Males
IV kisspeptin in hypogonadal men produces reliable LH pulses and testosterone elevation, demonstrating intact pituitary-gonadal axis response. This positions kisspeptin as a diagnostic and therapeutic tool for distinguishing hypothalamic from pituitary hypogonadism.
Hypothalamic Amenorrhea
Clinical studies in women with hypothalamic amenorrhea (common in athletes and those with low body weight) have demonstrated restored LH pulsatility and menstrual cycle recovery with kisspeptin administration — providing both mechanistic insight and therapeutic potential.
Sexual Arousal Research
Studies showing kisspeptin's role in sexual arousal behavior — beyond purely reproductive function — have established it as a link between the limbic system's reward circuits and the reproductive endocrine axis.
- Short half-life requires IV or frequent subcutaneous dosing — making chronic administration logistically demanding
- Pulsatility is critical — continuous kisspeptin infusion actually desensitizes the GnRH receptor, opposite to the intended effect; mimicking pulsatile release is technically challenging
- Nasal delivery bioavailability is insufficient for reliable hormonal effects in most studies
- Not approved for any indication — research compound status
- Interaction with existing hormone therapies (TRT, contraceptives) requires consideration
- Flushing
- Headache
- Abdominal discomfort