Best peptides for libido
For sexual desire, arousal, erectile function, low libido in men and women.
Reviewed by the amino101 editorial team. , first published .
Libido is the rare category with an approved peptide at the top. PT-141 was built for sexual desire, has two phase 3 trials and an FDA approval in women, and is used off label by men. After that the list drops into research territory fast: a reproductive hormone with small 2023 infusion trials, a tanning peptide whose libido effect is a side effect, and a bonding hormone whose controlled trials mostly found placebo. Everything on the list except oxytocin is a melanocortin or reproductive axis compound that raises blood pressure or hormones, so the side effect lines matter. Educational ranking, not a protocol.
- 1Full guidePT-141Extensively studied
The approved one. Bremelanotide acts on melanocortin receptors in the hypothalamus to raise desire itself, with erection in men as a downstream effect. Two phase 3 trials in women, earlier trials in men including sildenafil non responders. Nausea in about 40 percent and a blood pressure rise for up to 12 hours are the costs.
Dosage0.5 to 2 mgFrequencyas needed, no more than once per 24 hours and 8 doses per monthRouteSubcutaneous, Intranasal - 2Full guideKisspeptin-10Well researched
The upstream switch for the reproductive axis. Reliably raises LH and testosterone for a few hours in men, and small 2023 trials found infusions increased brain responses to sexual stimuli in people with low desire. Subcutaneous home use for libido is untested; the receptor desensitizes if pushed.
Dosage50 to 100 mcgFrequencyonce daily or every other dayRouteSubcutaneous, Intravenous, Intranasal - 3Full guideMelanotan-2Limited research
The libido effect was discovered as a side effect of a tanning peptide, and it is real, with a small controlled trial in psychogenic erectile dysfunction. It also tans you, darkens moles, suppresses appetite and causes nausea that is nearly universal early on. PT-141 was isolated from it for a reason.
Dosage0.25 to 1 mgFrequencydaily during loading, then 1 to 2 times weeklyRouteSubcutaneous, Intranasal - 4Full guideOxytocinExtensively studied
The bonding hormone, used as a nasal spray before intimacy. Controlled trials in couples and in women with sexual dysfunction found no advantage over placebo on desire or arousal; some reported more intense orgasm. Cheap, mild, and never to be injected at home.
Dosage10 to 40 IUFrequencyonce daily or per occasionRouteIntranasal, Intramuscular
PT-141 for desire, in either sex, starting at 0.5 to 1 mg to find the dose that works without the nausea, never with uncontrolled blood pressure and never with stimulants on the same day. Kisspeptin-10 for the man who wants a hormonal nudge and will check LH and testosterone, with the caveat that the libido trials used infusions in a lab. Melanotan-2 only if a tan is also wanted and the mole darkening is accepted. Oxytocin as a low stakes nasal add on with expectations set near placebo. None of this is a plan; the compounds are an educational topic and low libido with no obvious cause is worth a hormone panel and a conversation with a prescriber first.
Dosage at a glance
What appears in research and community protocols for each pick. Every number links to the full protocol table and calculator on the compound page.
| Peptide | Dosage | Frequency | Route | Cycle | First effects |
|---|---|---|---|---|---|
| PT-141 | 0.5 to 2 mg per dose (the approved dose is 1.75 mg) | as needed, no more than once per 24 hours and 8 doses per month | Subcutaneous, Intranasal | not cycled, used per occasion | desire and arousal within 1 to 2 hours, peak a few hours in, can persist into the next day |
| Kisspeptin-10 | 50 to 100 mcg | once daily or every other day | Subcutaneous, Intravenous, Intranasal | 4 to 8 weeks | LH and testosterone rise within hours of each dose and fall back the same day; any lasting change is judged on bloodwork at 4 to 8 weeks |
| Melanotan-2 | 0.25 to 1 mg | daily during loading, then 1 to 2 times weekly | Subcutaneous, Intranasal | 2 to 3 week loading phase, then maintenance as desired | nausea and flushing within an hour of the first doses, visible darkening within 1 to 2 weeks, full tan in 2 to 3 weeks |
| Oxytocin | 10 to 40 IU, most trials used 24 IU | once daily or per occasion | Intranasal, Intramuscular | per occasion; trial courses ran 4 to 24 weeks | subtle calm or warmth within 30 to 60 minutes if anything is felt at all; many people notice nothing, and the controlled trials mostly found no difference from placebo |
Side effects to expect
- ▲Nausea, in roughly 40 percent of trial participants, worst at the full dose and the first few uses
- ▲Flushing and facial redness
- ▲Headache
- ▲Flushing or a warm feeling shortly after injection
- ▲Headache
- ▲Injection site redness or itching
- ▲Nausea and sometimes vomiting, nearly universal for the first several doses
- ▲Flushing and facial redness
- ▲Darkening of moles and freckles, and new moles appearing
- ▲Nasal irritation, runny nose or sneezing after a spray
- ▲Headache
- ▲Flushing or a feeling of warmth
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Best peptides for libido: frequently asked
What is the best peptide for libido?
PT-141, by a wide margin, because it was designed for exactly this and has the trials to show it. It is approved as Vyleesi for low sexual desire in premenopausal women at 1.75 mg, and used off label by men at 1 to 2 mg, injected 45 minutes to 2 hours before activity with a limit of once per 24 hours and eight doses a month. It works through desire rather than blood flow, which is why it helps some men who do not respond to sildenafil.
Does PT-141 work for men?
Off label, yes. The early development program was in men with erectile dysfunction, where intranasal bremelanotide produced erections including in some sildenafil non responders; the nasal form was dropped over blood pressure concerns, not lack of effect. No controlled trial has measured desire as a primary outcome in men, but the mechanism and community reports are consistent. The same blood pressure exclusions apply.
PT-141 or Melanotan 2 for libido?
PT-141. Melanotan-2 hits four melanocortin receptors at once, so the libido effect comes bundled with tanning, mole darkening, appetite loss and nausea that is nearly universal for the first doses. PT-141 is the metabolite researchers isolated from it to keep the sexual effect and drop the pigmentation. Taking both stacks the nausea and blood pressure rise with no added benefit; see PT-141 vs Melanotan II.
Does oxytocin nasal spray increase libido?
The controlled evidence says not much. A crossover trial in healthy couples found no significant change in desire or arousal with intranasal oxytocin before sex, and a trial in women with sexual dysfunction found placebo did as well. Some participants reported more intense orgasm. Trials used 24 IU taken 30 to 45 minutes before; the injectable hospital form should never be used at home. The comparison with the approved option is at oxytocin vs PT-141.
Does kisspeptin-10 raise testosterone and libido?
It raises LH within an hour and testosterone over the next few hours in healthy men, then everything returns to baseline, and continuous high dosing suppresses the axis rather than boosting it. For libido, small 2023 trials found infusions increased brain responses to sexual stimuli and improved arousal measures in men and women with low desire. Community protocols report 50 to 100 mcg subcutaneously once daily or every other day; whether that reproduces the lab findings is untested. It is prohibited by WADA.
Related reading
Same tan, different side effects. Which melanotan is which?
The libido peptide was discovered inside the tanning peptide. Which one do you want?
The bonding hormone against the approved desire drug. Which one does what people hope, and which one is mostly placebo?
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