Source comparison
HCG vs. Kisspeptin | Comprehensive Comparison
Kisspeptin-10 and hCG both work to stimulate the HPG axis at different levels, ultimately modulating testicular function in men and ovarian function in women. In men, this can help faster recovery of testicular function, fertility, and testosterone synthesis a
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- Kisspeptin-10 and hCG both work to stimulate the HPG axis at different levels, ultimately modulating testicular function in men and ovarian function in women.
- In men, this can help faster recovery of testicular function, fertility, and testosterone synthesis after exogenous hormone use, including testosterone replacement therapy (TRT) and anabolic androgenic steroid (AAS) use.
- Here are the most notable aspects of hCG therapy, including the mechanisms behind its potential to increase serum testosterone (T) levels:
- hCG mimics the function of LH, directly stimulating the testes in men and ovaries in women. However, hCG cannot mimic the function of FSH. Therefore, FSH is sometimes added to hCG therapy to improve its effectiveness [15].
- Once applied, hCG can stimulate the function of the ovaries in women and testes in men regardless of the condition of the pituitary gland or the hypothalamus. Thus, it can be used in subjects with pituitary problems and infertility. Yet, it will be ineffective in individuals with testicular or ovarian damage.
- A study in men with an average total testosterone of 361.8ng/dl reported that an average of six months of 2000IU/weekly hCG led to a mean T level rise to 519.8ng/dl [16].
- While kisspeptin-10 differs in its mechanisms, it may lead to a similar increase in T levels after a single administration:
- Studies suggest that kisspeptin-10 can kickstart the HPG axis, stimulating the release of GnRH and triggering both LH and FSH release. As mentioned, these are the main hormones stimulating the testes in men and ovaries in women. Moreover, researchers also report that it can “reset” the hypothalamic GnRH pulse generator in men [17].
- Kisspeptin-10 is effective only in individuals who retain the capacity for hormonal production in the hypothalamus, pituitary, and reproductive glands. Injecting the peptide is believed to trigger peripheral dendritic terminals of GnRH neurons and stimulate the HPG axis without crossing the blood-brain barrier (BBB) [18].
- A study in healthy male volunteers reports that a single continuous infusion of kisspeptin-10 can boost mean serum testosterone levels from a baseline of 479ng/dl to 692ng/dl [19].
- Although no studies have confirmed this for kisspeptin-10, research on kisspeptin-54 shows that repeated administration in women (twice daily) may decrease the effectiveness of both the peptide and endogenous kisspeptins, thereby shutting down the HPG axis. The effect on desensitization was less pronounced but still present with twice-weekly application [20].
- Researchers should also note that kisspeptin-54 may lead to stronger receptor desensitization compared to kisspeptin-10 due to its longer half-life as reported by preclinical trials [21].