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Ranked by human evidence

Best Peptides for Libido, Ranked by Human Evidence

PT-141 (bremelanotide) has the strongest human evidence for libido: 2 Phase 3 trials led to its FDA approval for low sexual desire in premenopausal women. hCG and hMG also rate strong, but for fertility. I found no trial of oxytocin nasal spray in sexual function, and kisspeptin's sexual findings come from single-dose studies in healthy volunteers.

This is the unusual corner of the site: the best-known compound here is an approved prescription medicine with real randomised trials behind it, sold in parallel through grey-market channels where nothing is verified. The evidence question and the sourcing question have opposite answers, and both matter.

Related: BPC-157 for erectile dysfunction · Kisspeptin vs hCG

Peptides for libido, ranked by human evidence

The order is the strength of human evidence, strongest first: strong, moderate, limited, animal or lab only, then none. Ties keep the site's usual compound order. A higher rank means more and better human studies, not that a compound works for libido, so check what each study measured.

Peptides for libido compared: evidence level, US legal status and what human studies measured
RankCompoundEvidenceUS statusMeasured in humansGuide
1PT-141Strong human evidenceFDA-approved · prescription onlySexual desire in 2 Phase 3 trials in premenopausal women with low desire, the basis of its FDA approval.Read
2Human Chorionic GonadotropinStrong human evidenceFDA-approved · prescription onlyIts approved uses: undescended testes in boys, male hypogonadotropic hypogonadism and ovulation induction.Read
3Human Menopausal GonadotropinStrong human evidenceFDA-approved · prescription onlyFollicle development in IVF-style treatment (a label trial of 373 women); off-label sperm production in men.Read
4OxytocinModerate human evidenceFDA-approved · prescription only71 randomised trials of the nasal spray in autism, obesity and social cognition; none in sexual function.Read
5GonadorelinModerate human evidenceUnapproved drugOvulation in 109 women with hypothalamic amenorrhea, and pituitary testing; no trial I located tested it alongside TRT.Read
6KisspeptinLimited human dataResearch use onlyHormone responses and sexual-brain processing in single-dose studies of healthy volunteers.Read
7TestagenAnimal / lab onlyResearch use onlyNone: animal studies of its sequence measured thyroid and thymus outcomes in birds.Read
  1. Prescription / GLP-1FDA-approved · prescription only

    1. PT-141

    Strong human evidence

    Measured in humans: Sexual desire in 2 Phase 3 trials in premenopausal women with low desire, the basis of its FDA approval.

    Why this rating

    Two identical Phase 3 randomised, double-blind, placebo-controlled multicentre trials (RECONNECT) in premenopausal women with hypoactive sexual desire disorder, supported by Phase 2b dose-ranging responder analyses and a safety review across the development programme. One older randomised trial exists in men who had not responded to sildenafil; the journal that published it issued a formal Expression of Concern about it in 2023.

  2. Prescription / GLP-1FDA-approved · prescription only

    2. Human Chorionic Gonadotropin

    Strong human evidence

    Measured in humans: Its approved uses: undescended testes in boys, male hypogonadotropic hypogonadism and ovulation induction.

    Why this rating

    FDA has approved chorionic gonadotropin injection (e.g. Novarel) for three specific indications - prepubertal cryptorchidism, selected male hypogonadotropic hypogonadism, and ovulation induction - based on the data reviewed for approval, with the dosing schedules below on the current label. Separately, FDA and FTC have taken joint enforcement action against over-the-counter "homeopathic" hCG products sold for weight loss, which are unapproved and for which FDA states there is no substantial evidence of a weight-loss effect.

  3. Prescription / GLP-1FDA-approved · prescription only

    3. Human Menopausal Gonadotropin

    Strong human evidence

    Measured in humans: Follicle development in IVF-style treatment (a label trial of 373 women); off-label sperm production in men.

    Why this rating

    FDA has approved menotropins for injection (Menopur) for follicle development in ART cycles, based on the data reviewed for approval, with the dosing schedule on the current label built on a trial of 373 women. Separately, published human studies have tested hMG combined with hCG to restore spermatogenesis in men with hypogonadotropic hypogonadism - including a 2019 study of 220 men that the abstract describes as dividing patients between treatments rather than randomising them - real clinical evidence for that off-label male use, though not in a population defined specifically by testosterone-therapy-induced suppression.

  4. Prescription / GLP-1FDA-approved · prescription only

    4. Oxytocin

    Moderate human evidence

    Measured in humans: 71 randomised trials of the nasal spray in autism, obesity and social cognition; none in sexual function.

    Why this rating

    Seventy-one randomised trials of intranasal oxytocin, in autism spectrum conditions, obesity and social cognition. A search for randomised trials of intranasal oxytocin in erectile function, libido or sexual function returned none. The rating covers the intranasal research literature, which is not about the marketed use.

  5. Prescription / GLP-1Unapproved drug

    5. Gonadorelin

    Moderate human evidence

    Measured in humans: Ovulation in 109 women with hypothalamic amenorrhea, and pituitary testing; no trial I located tested it alongside TRT.

    Why this rating

    Real controlled human evidence exists, but it belongs to the approved, historical uses. The pivotal multicenter trial behind Lutrepulse's approval gave pulsatile intravenous gonadorelin acetate to 109 women with hypothalamic amenorrhea and reported ovulation in 91-96% of them. A 2021 study still used a 100-microgram intravenous bolus as a pituitary stimulation test in adult men. Chinese cohort studies report pulsatile subcutaneous-pump treatment inducing spermatogenesis in adult men with congenital hypogonadotropic hypogonadism. None of this evidence covers the popular current use - low-dose subcutaneous gonadorelin self-injected alongside testosterone therapy to preserve testicular size and fertility - for which I located no published human trial. See the dosing page for the studies themselves, cited.

  6. Research peptidesResearch use only

    6. Kisspeptin

    Limited human data

    Measured in humans: Hormone responses and sexual-brain processing in single-dose studies of healthy volunteers.

    Why this rating

    FDA's 2024 evaluation of kisspeptin-10 for compounding found insufficient evidence to conclude it is effective for secondary hypogonadism in men, citing small, exploratory, short-duration studies with inconsistent dosing routes. The sexual-brain-processing findings come from a handful of single-dose, placebo-controlled academic trials in healthy volunteers, not patients, and have not been replicated as a treatment outcome. Human data exist and are genuine; they are small, mostly acute, and none support a treatment claim yet.

  7. Research peptidesResearch use only

    7. Testagen

    Animal / lab only

    Measured in humans: None: animal studies of its sequence measured thyroid and thymus outcomes in birds.

    Why this rating

    I could not find a single PubMed-indexed paper studying "Testagen" by that name; a title/abstract search for "Testagen" returns two results, neither about this peptide. Searching by its actual chemical sequence, Lys-Glu-Asp-Gly, finds a real cluster of animal studies from one Russian research group - but every one I could verify measured thyroid-gland structure/hormones or thymus morphology in hypophysectomized chickens, not testicular or reproductive-hormone outcomes. No human study of any kind is verifiable for this compound.

Common questions about peptides for libido

What is the strongest peptide for libido?

By human evidence, PT-141 (bremelanotide, sold as Vyleesi). Two Phase 3 trials in premenopausal women with hypoactive sexual desire disorder supported its FDA approval. One older trial in men who had not responded to sildenafil exists, but its journal issued an Expression of Concern about it in 2023.

Which peptide acts like Viagra?

None does. Viagra (sildenafil) treats erectile dysfunction through blood flow. PT-141 acts on brain pathways tied to sexual desire, and is approved only for premenopausal women with low desire, not for men or erectile function. A PubMed search finds no study of BPC-157 for erectile dysfunction, in animals or humans.

Is PT-141 approved for men?

No. Its FDA approval covers premenopausal women with acquired, generalised hypoactive sexual desire disorder. It is widely sold as a research chemical to men, for a use it was never approved for.

Does oxytocin nasal spray increase libido?

Intranasal oxytocin has been studied in 71 randomised trials, in autism, obesity and social cognition, and a search found none in sexual function, erectile function or libido. Injectable oxytocin is an approved medicine used in childbirth.

Does CJC-1295 increase libido?

I found no study that measured libido with CJC-1295. Its human data is 2 placebo-controlled trials in healthy adults that measured growth hormone and IGF-I levels.

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