PT-141 (Bremelanotide)
Clinical evidenceAn accidental sex peptide: the tanning-drug team kept noticing everyone got erections.
What it is
PT-141, formally bremelanotide, is a cyclic peptide that stimulates melanocortin receptors. It is FDA-approved as Vyleesi for low sexual desire in premenopausal women. It is structurally one step away from the tanning peptide melanotan II — literally where it came from.
How it works
It works on desire, not plumbing. It activates a receptor (MC4R) in brain regions that govern sexual drive, which is a different lever from erection drugs like sildenafil that act on blood vessels. Peak effect lands 45-90 minutes after a shot and lasts a few hours.
What people report
- ✦Treats hypoactive sexual desire disorder (approved use in women)
- ✦Often used off-label for men who don't respond to erection pills
- ✦A small trial found ~34% of such men achieved erections vs 9% on placebo
- ✦Some users report a notably strong subjective effect
Typical use
Used on an as-needed basis before sexual activity rather than a daily or weekly cycle.
Dosing reference
A small subcutaneous injection taken shortly before sexual activity. Prescription only as Vyleesi.
Reference only — not a recommendation. Verify via primary sources.
Watch for
About 40% of users get nausea on the first dose. Response is highly variable — strong in those who respond, nearly nothing in those who don't. The male off-label use is not FDA-sanctioned, though it is being formally studied.
Notes
Two decades from accidental discovery to approval, at which point researchers still debated whether the average effect size is clinically meaningful for everyone.
Reconstitution math for PT-141 (Bremelanotide)
Typical vial: 10mg dissolved in 2ml BAC water. Adjust to see the math.
Reconstitution Calculator
Understand the math — pick a peptide, see its info, and how reconstitution works.
BPC-157
Healing & recoveryThe repair peptide everyone in the gym talks about — powerful in rats, still unproven in humans.
BPC-157 is a short chain of 15 amino acids. It is not a natural hormone your body makes on its own. It was built in a lab as a fragment of a larger 'body protection compound' first found in human stomach juice in the 1990s. Vendors sell this engineered piece, not a natural sequence.
How it works (optional detail)
In animal studies, BPC-157 seems to nudge faster blood-vessel growth at injured spots, which is the body's first step in healing. It also appears to quiet inflammation. The idea is that by tickling repair pathways rather than ordering one single thing, it helps tendons, ligaments, and gut lining recover speedier than they would on their own.
Dosing reference: Common community dosing is a few hundred micrograms a day, usually injected near the site or into belly fat. There is no approved human dose.
Reconstitution math
Concentration: 5.000 mg/ml (10mg in 2ml)
To get 1mg, draw:
0.200 ml
≈ 20 units on a U-100 insulin syringe
This calculator shows how the arithmetic works using common vial sizes. It is an educational illustration — not a dosing recommendation. Always follow the specific product's instructions and verify with primary sources or a qualified professional.
Educational content — not medical advice.