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Sexual Health Peptides
Peptides for libido enhancement, sexual function, and reproductive hormone support.
What Are Sexual Health Peptides?
Sexual health peptides target libido, arousal, and reproductive hormone signaling through pathways that are entirely different from traditional ED drugs. While PDE5 inhibitors like Viagra and Cialis address blood flow mechanics, these peptides work on desire and hormonal signaling in the brain. This page covers 11 compounds.
PT-141 (Bremelanotide, brand name Vyleesi) is the most proven option. It's FDA-approved for hypoactive sexual desire disorder (HSDD) in premenopausal women and works by activating MC4 melanocortin receptors in the hypothalamus. Clinical trials showed a meaningful increase in desire and decrease in distress related to low libido. PT-141 works in both men and women, though the FDA indication is currently female-specific. Effects start about 45 minutes after subcutaneous injection and can last 12 to 24 hours. It's dosed as-needed, not daily.
Melanotan II activates the same melanocortin receptor family but is primarily known for its tanning effects. Increased libido is a well-documented side effect. In fact, PT-141 was developed specifically to isolate the sexual response from Melanotan II's broader melanocortin activation. Melanotan II remains a research-only compound with no FDA approval; nausea and facial flushing are the most common complaints.
Kisspeptin-10 takes a different approach entirely. It stimulates GnRH (gonadotropin-releasing hormone) release from the hypothalamus, which drives downstream production of LH, FSH, testosterone, and estrogen. Published research has explored Kisspeptin for both male and female sexual dysfunction, including a study showing increased limbic brain activity in response to sexual stimuli (PMID 28253098). It's positioned as a more physiological approach than direct receptor agonists.
For men focused on testosterone support specifically, Gonadorelin (a synthetic GnRH analog) and Enclomiphene (a selective estrogen receptor modulator) are also in this category. Both target the HPG axis to maintain or restore natural testosterone production.
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All Sexual Health Peptides(11)
HCG (Human Chorionic Gonadotropin)
HCG mimics luteinizing hormone and is the most evidence-backed option for preserving fertility and testicular volume during TRT. The Coviello 2005 dose-response trial confirmed that low doses maintain intratesticular testosterone, though brand-name pricing after the 2020 compounding ban remains a real barrier.
Leuprolide (Lupron)
Leuprolide (Lupron) is an FDA-approved GnRH agonist prescribed for prostate cancer, endometriosis, uterine fibroids, and precocious puberty. Depot formulations cover monthly to six-month dosing. The initial hormone flare requires careful management, and bone density monitoring is standard during therapy. Over 4,160 PubMed publications support its clinical profile.
TRT (Testosterone Replacement Therapy)
TRT (Testosterone Replacement Therapy) restores testosterone in hypogonadal men using FDA approved injectable cypionate. The TRAVERSE trial (n=5,246) confirmed cardiovascular safety. Split dosing twice weekly is now standard at most clinics. Total testosterone targets typically run 500 to 800 ng/dL.
PT-141
PT-141 (bremelanotide) is the only FDA-approved peptide targeting sexual desire through MC4R activation. The RECONNECT Phase 3 trials confirmed efficacy in 1,247 women with HSDD. Nausea hits 40% of users but typically improves after the first few doses with repeat use.
Gonadorelin
Gonadorelin is the synthetic form of GnRH, FDA-approved since 1978. Used alongside TRT to preserve testicular function and fertility. Dosing frequency matters more than dose size; its 2 to 40 minute half-life makes protocol design the key deciding factor.
Oxytocin
Oxytocin is a nine-amino-acid neuropeptide with FDA approval for labor induction (Pitocin) and a large community evidence base for social anxiety and bonding. Clinical trials use 20 to 40 IU intranasal. Effects kick in around 30 minutes. Receptor downregulation limits daily use.
Melanotan II
Melanotan II activates five melanocortin receptors, producing UV-free tanning, libido enhancement, and appetite suppression. Phase 1 data confirmed its activity in the 1990s, but it never reached approval. Nausea during loading is near-universal. Community protocols dominate dosing guidance worldwide today.
Melanotan I
Melanotan I (afamelanotide) is the only FDA-approved melanocortin agonist, proven to increase sun tolerance 6x in EPP patients. More MC1R-selective than Melanotan II, it delivers eumelanin-based tanning without the sexual side effects or appetite changes. Approved via subcutaneous implant (Scenesse).
Kisspeptin-10
Kisspeptin-10 triggers LH and testosterone release by activating the hypothalamic KISS1R receptor upstream of GnRH. Studied for fertility and post-TRT recovery, it requires cycling to avoid receptor desensitization. Community dosing runs 100 to 200 mcg subcutaneous daily or twice daily.
Triptorelin
Triptorelin triggers an acute LH/FSH surge at a single 100 mcg dose, restarting testosterone production after steroid-induced suppression. FDA-approved at higher doses for prostate cancer (Trelstar), its PCT use rests on one landmark case report and strong community experience data.
Atosiban (Tractocile)
Atosiban (Tractocile) is a hospital-only IV tocolytic that blocks oxytocin receptors to delay preterm delivery by 48+ hours. EMA-approved since 2000 but rejected by the FDA. APOSTEL 8 (2025, n=752) challenged its neonatal benefit at later gestational ages, finding no improvement in composite outcomes versus placebo.