Which is better, HCG or kisspeptin-10?
hCG wins on evidence grade (human RCT and label evidence versus human physiology studies only) and on regulatory status (an FDA approved biologic available by prescription versus a Category 2 substance with no lawful route for human use). Kisspeptin-10 is scientifically interesting because it works upstream through the patient's own GnRH pulses, but the only chronic human data are 12 days of hormone measurements in 15 healthy men, and the one randomized trial in patients used kisspeptin-54, not kisspeptin-10. [1] [2] [6] [7] [8] [11] [12]
How do HCG and kisspeptin-10 compare?
| Dimension | HCG (human chorionic gonadotropin)Favored | Kisspeptin-10 |
|---|---|---|
| Evidence grade [2] [4] [6] [8] | Human RCT. Standard of care for ovulation triggering and for inducing puberty and fertility in hypogonadotropic men; sperm induced in 54 of 57 treatment courses in a 42 patient series. | Human observational. Physiology studies in groups of 4 to 15 healthy volunteers measuring LH, FSH, and testosterone; no study of a clinical endpoint. |
| Note: The 2026 randomized study of kisspeptin-10 measured hormone levels in healthy men, so it does not establish clinical benefit. | ||
| Mechanism [4] [5] [8] | Binds the LH receptor directly on Leydig cells (men) and theca and granulosa cells (women), bypassing the hypothalamus and pituitary. | Binds KISS1R on hypothalamic GnRH neurons, triggering the patient's own GnRH pulses and then pituitary LH and FSH release. |
| Note: Because kisspeptin-10 works upstream, it depends on an intact pituitary; hCG works even when pituitary LH is suppressed. | ||
| Use alongside testosterone therapy [1] [6] | Retrospective series of 26 men on testosterone given 500 IU every other day: no decline in semen parameters, no azoospermia, and 9 contributed to a pregnancy. | Not studied in men on testosterone therapy. |
| Half-life and dosing pattern [6] [8] [9] | Long half-life of about 24 to 36 hours allows injections 2 to 3 times per week (label schedules for hypogonadotropic hypogonadism). | Half-life of minutes; research protocols used intravenous boluses or subcutaneous pump infusions, and continuous infusion lost its effect while 8 hour daily infusions sustained it for 12 days. |
| Side effects [4] [8] [12] | Headache, edema, gynecomastia from rising estradiol, acne, injection site reactions; ovarian hyperstimulation and multiple pregnancy in women; rare thromboembolism. | No adverse effects reported in short research protocols; no long-term human safety data; FDA cites immunogenicity and impurity concerns for compounded product. |
| FDA and compounding status [8] [11] [12] | FDA approved (Pregnyl, Novarel, Ovidrel). Transitioned to a biologic on March 23, 2020, so compounded hCG is no longer lawful under 503A or 503B. | Not FDA approved. Placed on the 503A Category 2 list on September 29, 2023; a 503A pharmacy may not compound it. |
| WADA status [13] | Prohibited under S2 for male athletes. | Prohibited (S0 and S2 as a gonadotropin releasing agent without approval). |
| Note: Both are banned in tested sport, but on different grounds: hCG as a named S2 hormone in men, kisspeptin-10 as an unapproved substance and releasing factor. | ||
| Access path and cost [8] [9] [12] | Prescription filled at a retail or specialty pharmacy; brand vials roughly 100 to 300 USD per 10,000 units, lasting about 6 to 7 weeks at 500 IU three times weekly. | No lawful access outside a clinical trial. Products sold as research chemicals are not lawful for human use and are not verified for purity. |
| Weight loss claims [3] [8] [10] | Label states hCG is not effective adjunctive therapy for obesity; a meta-analysis of 24 trials found no benefit, and FDA calls over the counter hCG diet products illegal. | No weight loss claims or studies. |
Evidence grade and regulatory status
Pulled from each peptide’s own record, so it stays in step with the peptide pages.
| Attribute | HCG (human chorionic gonadotropin) | Kisspeptin-10 |
|---|---|---|
| Class | Glycoprotein hormone of the placenta (heterodimer of alpha and beta subunits, about 237 amino acids) that acts on the LH receptor; regulated as a biologic since 2020 | Ten amino acid C-terminal fragment of kisspeptin (KISS1 gene product), an agonist at the kisspeptin receptor (KISS1R, formerly GPR54) |
| What it is | FDA approved hormone for infertility and male hypogonadism; useless for weight loss and no longer compoundable since it became a biologic in 2020. | Fragment of a brain hormone that raises LH and testosterone in small human studies; still on FDA's 503A Category 2 safety risk list, so it cannot be compounded. |
| Evidence | Evidence: Human RCT evidence | Evidence: Human observational evidence |
| FDA status | Regulatory: FDA approved | Regulatory: Not eligible for compounding |
| Compounding | hCG is FDA approved as Pregnyl and Novarel (urinary derived chorionic gonadotropin) and Ovidrel (recombinant choriogonadotropin alfa). On March 23, 2020 these products transitioned from drug approvals to biologics license applications under the Biologics Price Competition and Innovation Act. FDA states that biological products are not eligible for the 503A or 503B compounding exemptions, so compounded hCG, which had been common in testosterone and weight loss clinics, became unlawful at that point. FDA has separately stated that over the counter hCG diet products are illegal and that hCG is not approved for weight loss. It is not on the FDA Category 2 list because it is an approved biologic rather than a bulk drug substance nomination. | FDA placed kisspeptin-10 on the 503A Category 2 list (substances that may present significant safety risks) on September 29, 2023, citing immunogenicity risk, peptide impurities, and no or limited safety information. As of the FDA page current to April 22, 2026, kisspeptin-10 remains in Category 2 and was not among the peptides withdrawn in April 2026 or taken up by the Pharmacy Compounding Advisory Committee in July 2026. It is not an FDA approved drug and a 503A pharmacy may not compound it. |
| WADA | WADA: WADA prohibited | WADA: WADA prohibited |
| Routes | Intramuscular injection (Pregnyl, Novarel labels), Subcutaneous injection (Ovidrel prefilled syringe; also common off-label practice with urinary hCG), Oral drops, pellets, and sprays sold for the hCG diet contain no meaningful hCG and are illegal per FDA | Intravenous bolus or infusion (research studies), Subcutaneous bolus or pump infusion (research studies), Subcutaneous injection vials (as sold, not lawful for human use) |
| Typical cost | Brand hCG (Pregnyl, Novarel) costs roughly 100 to 300 USD per 10,000 unit vial at retail pharmacies, which at 500 IU three times a week lasts about 6 to 7 weeks; Ovidrel prefilled syringes run roughly 150 to 250 USD each. Compounded hCG is no longer lawfully available. Prices verified on the last verified date. | Not available through licensed channels. Research chemical sellers list it, but those products are not lawful for human use and are not verified for purity. |
| Last verified |
Has HCG been tested directly against kisspeptin-10?
No published trial has compared HCG and kisspeptin-10 directly. The dimensions above come from separate studies and labels, and cross-trial comparisons are less reliable than a direct trial.
What do HCG and kisspeptin-10 cost?
| Dimension | HCG (human chorionic gonadotropin) | Kisspeptin-10 |
|---|---|---|
| Typical cost | Brand hCG (Pregnyl, Novarel) costs roughly 100 to 300 USD per 10,000 unit vial at retail pharmacies, which at 500 IU three times a week lasts about 6 to 7 weeks; Ovidrel prefilled syringes run roughly 150 to 250 USD each. Compounded hCG is no longer lawfully available. Prices verified on the last verified date. | Not available through licensed channels. Research chemical sellers list it, but those products are not lawful for human use and are not verified for purity. |
| Price detail | HCG (human chorionic gonadotropin) price by channel | Kisspeptin-10 price by channel |
Where a price index exists, the range is the cash price per month across branded, compounded, and telehealth channels, without insurance. The cost pages give each channel separately with its sources. Otherwise the typical cost from the peptide record is shown. Legal access depends on your state: see peptide legality by state.
Frequently asked questions
Can kisspeptin-10 replace hCG for men on testosterone?
There is no evidence that it can. hCG has a retrospective series showing preserved semen parameters in men on testosterone, while kisspeptin-10 has only been studied in healthy men not taking testosterone, for up to 12 days, with hormone levels as the endpoint. Kisspeptin-10 also requires a responsive pituitary, which exogenous testosterone suppresses. [1] [4] [6]
Which is legal to get in the United States?
Only hCG, and only as brand Pregnyl, Novarel, or Ovidrel by prescription. Compounded hCG became unlawful when it transitioned to a biologic in 2020, and kisspeptin-10 has been on the FDA Category 2 list since September 2023, so no pharmacy may compound it. [8] [11] [12]
Why would anyone use kisspeptin-10 instead of hCG?
The theoretical appeal is that kisspeptin-10 stimulates the body's own GnRH, LH, and FSH rather than replacing LH, and research groups study kisspeptins for fertility and sexual desire. In practice the human data are hormone measurements in small groups of healthy volunteers, and the randomized trial on sexual desire used kisspeptin-54. [5] [6] [7]
Are both banned in sport?
Yes. hCG is prohibited in male athletes under section S2 of the WADA Prohibited List, and kisspeptin-10 is prohibited as an unapproved substance that stimulates gonadotropin release. [13]
Does either help with weight loss?
No. The hCG label says it has not been shown to be effective for obesity, a meta-analysis of 24 trials found no benefit, and FDA warns that over the counter hCG diet products are illegal. Kisspeptin-10 has not been studied for weight loss. [3] [8] [10]
Conditions studied
From the blog
- Peptides for men, ranked by human evidence
hCG, GLP-1 drugs, teriparatide, and tesamorelin have human trials and a lawful route. PT-141 is off-label for men, and kisspeptin and melanotan II have no lawful path. Ranking, legality, and WADA.
Sources
Numbered citations above point to these primary sources. PubMed entries link to the indexed abstract.
- [1]Hsieh TC et al. Concomitant intramuscular human chorionic gonadotropin preserves spermatogenesis in men undergoing testosterone replacement therapy. J Urol 2013PubMed 23260550, 2013
- [2]Buchter D et al. Pulsatile GnRH or human chorionic gonadotropin/human menopausal gonadotropin as effective treatment for men with hypogonadotropic hypogonadism: a review of 42 cases. Eur J Endocrinol 1998PubMed 9758439, 1998
- [3]Lijesen GK et al. The effect of human chorionic gonadotropin (HCG) in the treatment of obesity by means of the Simeons therapy: a criteria-based meta-analysis. Br J Clin Pharmacol 1995PubMed 8527285, 1995
- [4]Jayasena CN et al. The effects of kisspeptin-10 on reproductive hormone release show sexual dimorphism in humans. J Clin Endocrinol Metab 2011PubMed 21976724, 2011
- [5]Jayasena CN et al. Direct comparison of the effects of intravenous kisspeptin-10, kisspeptin-54 and GnRH on gonadotrophin secretion in healthy men. Hum Reprod 2015PubMed 26089302, 2015
- [6]Yeung AC et al. Chronic subcutaneous kisspeptin-10 stimulates gonadotropin secretion for 12 days in healthy men. Eur J Endocrinol 2026PubMed 42549827, 2026
- [7]Mills EG et al. Effects of kisspeptin on sexual brain processing and penile tumescence in men with hypoactive sexual desire disorder: a randomized clinical trial. JAMA Netw Open 2023PubMed 36735255, 2023
- [8]FDA prescribing information for Pregnyl (chorionic gonadotropin for injection), via DailyMedFDA
- [9]FDA prescribing information for Novarel (chorionic gonadotropin for injection), via DailyMedFDA
- [10]FDA consumer update: Avoid dangerous HCG diet products (hCG is not approved for weight loss; over the counter hCG products are illegal)FDA
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