PT-141
A synthetic melanocortin peptide that works in the brain, not the bloodstream, to raise sexual desire and arousal. People run it before intimacy for libido in both men and women, and it is the research cousin of the FDA-approved drug Vyleesi.
Where to buy PT-141, cheapest first.
Prices from 6 vendors across the market. We link straight to each vendor’s product page and grade vendors on public lab data, so you’re not just chasing the lowest number.
PT-141
What PT-141 actually does.
The simple version first, then a little more for the curious. No biochem degree required.
It switches on desire in the brain itself, activating melanocortin receptors tied to arousal, rather than working on blood flow the way Viagra-style drugs do.
How it works
PT-141 (bremelanotide) is a melanocortin receptor agonist. It activates the MC3R and MC4R receptors in the central nervous system, which sit on the brain's arousal and reward pathways and nudge dopamine signaling. The result is studied as a rise in sexual desire itself.
Where it acts
Unlike PDE5 drugs such as sildenafil that act on blood vessels, PT-141 acts centrally, in the brain. That is why it is studied for low desire rather than purely mechanical function, and why it can apply to both men and women.
What people notice
Users typically report increased desire and arousal beginning within roughly 45 minutes to a couple of hours of a dose, lasting several hours. It is taken before intimacy on an as-needed basis, not daily.
Honest caveat: the human evidence is strongest for the approved subcutaneous drug Vyleesi in premenopausal women with hypoactive sexual desire disorder. Use in men, and the research-grade vials vendors sell, sit well outside that label. It is sold strictly for research use only. None of this is medical advice, talk to a licensed provider before starting anything.
How to take it.
PT-141 is an injection, given subcutaneously into fat with a tiny insulin needle, about 45 minutes before intimacy. The FDA-approved Vyleesi pen uses this same subcutaneous route. An intranasal spray form exists in the research world, but nasal trials were halted years ago over blood pressure spikes, so subcutaneous is what people run. The routine is below; for timing and cycling, see the full guide.
Reconstitute the vial
Add bacteriostatic water down the side of the vial (a 10mg vial + 2mL = 5mg/mL). Let it dissolve. Swirl gently, don't shake.
Draw your dose
On a U-100 insulin syringe, pull to your unit mark. A 1mg dose at 5mg/mL is 20 units (0.2mL). Many people start lower, around 0.5mg, to gauge nausea. Use the calculator if you're unsure.
Pinch and inject
Swab with alcohol, pinch a bit of fat on the belly or thigh, insert at 45–90°, push slowly. Time it about 45 minutes before intimacy.
Rotate and store
Move to a different spot each time so no area gets sore. Keep no more than one dose in 24 hours. Store the reconstituted vial in the fridge between uses.
The easiest spots are the belly (about 2 inches either side of the navel), the love handles, the front of the thigh, and the back of the upper arms. Rotate every injection.
Don't do the math, let the calculator do it.
This is PT-141's typical setup, already worked out. Change any value and the draw updates instantly.
Typical PT-141 dose: around 1 to 2 mg subcutaneously, taken roughly 45 minutes before intimacy on an as-needed basis. The approved Vyleesi dose is 1.75 mg. Many people start near 0.5 mg to gauge nausea, with no more than one dose per 24 hours and a common ceiling of about eight doses a month.
Cycling PT-141.
Whether PT-141 is cycled at all, how long people run it, and the honest reasoning behind it.
Taken per dose before activity, not cycled.
PT-141 does not really cycle the way a recovery peptide does, because it is not run continuously. It is taken as-needed, before intimacy, so the relevant limits are per-dose and per-month rather than a weeks-on, weeks-off block.
The reason the ceilings matter is blood pressure. PT-141 transiently raises blood pressure after each dose, so spacing doses out and not exceeding the daily and monthly limits is the cautious, widely followed approach.
- One dose per 24 hours at most, taken about 45 minutes before intimacy.
- Around eight doses a month is the common ceiling, mirroring the approved label.
- Mind your blood pressure. If you have any cardiovascular concern, this is a conversation for a licensed provider before you start, not after.
Want the full picture, on and off periods, the washout, stacking, and keeping your results? Read how peptide cycling works →
What's actually in the vial.
For 3 of these vendors we link the per-batch certificate itself (a specific lab report, COA PDF, or certificate image), and the purity below is read straight off that certificate. The rest link to the vendor's general lab-results page. We don't run the labs ourselves and we don't show a purity number unless it's printed on a certificate we link, so you can open the document and check it against the batch yourself.
| Vendor | Purity (per COA) | Batch / report | Certificate |
|---|---|---|---|
| EZ Peptides | 99.912% | EZP-PT1005172026-08 | Janoshik report ↗ |
| Onyx Biolabs | 99.916% | PT110-260323A | View COA ↗ |
| Swiss Chems | 99.8% | CY1008 | View COA ↗ |
| Midwest Peptide | see lab page | not shown | Lab results ↗ |
| Next Gen Peptides | see lab page | not shown | Lab results ↗ |
| Penguin Peptides | see lab page | not shown | Lab results ↗ |
What people pair it with.
PT-141 is usually run on its own, before intimacy. When people do combine it, these are the pairings that come up for sexual health.
Desire & connection
PT-141 drives desire centrally; oxytocin is the bonding and closeness peptide. People pair them ahead of intimacy hoping to layer arousal with emotional connection. Investigational, with little controlled human data.
View stack →Hormonal libido support
Kisspeptin sits upstream of the body's own sex-hormone signaling, while PT-141 acts on brain arousal pathways. The idea is to support libido from two different angles. Evidence here is early.
View stack →Desire plus blood flow
Some men combine the central desire effect of PT-141 with a PDE5 inhibitor that works on blood flow. Combining two agents that can both lower or shift blood pressure is a real caution, so this is strictly a provider conversation.
View stack →In the same corner.
Other peptides people compare against or run near PT-141 for sexual health.
Questions, answered straight.
Is PT-141 legal?
The active ingredient, bremelanotide, is FDA-approved as the prescription drug Vyleesi for premenopausal women with low sexual desire. The research vials vendors compare here are not that product, and are sold strictly for research use only, not as a medicine. Rules vary by country, so check what applies where you are.
What does research use only actually mean?
It means the product is sold for laboratory and research purposes, not as a supplement or medicine for people. The research-grade vial has not been reviewed or approved for human use by the FDA. We aggregate prices and public lab data so you can see the landscape; what you do with that is between you and a licensed provider.
How is it different from Viagra?
Viagra and Cialis are PDE5 inhibitors that act on blood flow in the body. PT-141 acts in the brain on melanocortin receptors to raise desire itself. That is why it is studied for low libido rather than purely mechanical function, and why it applies to both men and women.
How long before it works, and how long does it last?
People typically feel effects within about 45 minutes to two hours of a subcutaneous dose, lasting several hours. It is taken before intimacy on an as-needed basis, not on a daily schedule.
What about nausea?
Nausea is the most common complaint, reported by roughly 40 percent of users in trials, usually with the first dose or two and often mild. Starting at a lower dose, around 0.5 mg, is a common way people gauge tolerance before moving up.