Men's Wellness · 5mg vial
PT-141(Bremelanotide)
PT-141 is a synthetic melanocortin agonist that activates MC3R and MC4R receptors in the hypothalamus — the brain's sexual arousal center. Unlike PDE5 inhibitors (which work on blood flow), PT-141 works through a central nervous system pathway, making it effective regardless of vascular health status. It enhances libido and sexual motivation in research models.
Concentration reference
Standard mix: 5mg vial + 1mL BAC water = 5mg/mL. Each 0.1mL (10 IU) = 500mcg.
Dosing schedule
| Phase / Use | Dose | Draw Volume | Frequency | Notes |
|---|---|---|---|---|
| Starting / Low | 500mcg | 0.1mL (10 IU) | As needed — 45 min prior | First-use protocol — assess individual response |
| Standard | 1mg | 0.2mL (20 IU) | As needed — 45 min prior | Most effective dose in research models |
| High | 1.5mg | 0.3mL (30 IU) | As needed — 45 min prior | Increase only if 1mg insufficient after 3+ uses |
| Maximum | 2mg | 0.4mL (40 IU) | As needed — 45 min prior | Upper boundary — higher doses increase side effect frequency |
Reconstitution calculator
Concentration
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Draw volume
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On insulin syringe
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U-100 insulin syringe: 1 mL = 100 IU. Calculation for research reference only.
Injection sites
Subcutaneous abdomen, lower back, or outer thigh. Abdomen provides most consistent and predictable absorption rate. Do not inject into upper arm — absorption less predictable.
Timing
30–60 minutes before intended effect window. Onset varies 30–90 min. Effects last 6–12 hours in research models. Do not use daily — minimum 3 days between administrations.
Cycle length
As-needed basis, not a continuous cycle. No receptor desensitization reported at recommended intervals. Monthly use patterns are common.
Stacking
Not typically stacked. Some protocols pair with Kisspeptin for hormonal support alongside libido effects.
Warnings
- ⚠Minimum 3 days between uses — more frequent use increases nausea without improving efficacy
- ⚠Do not exceed 2mg — higher doses increase side effect frequency with diminishing returns
Tips
- ✔Start at 500mcg for first 2–3 uses — many research subjects find this fully sufficient
- ✔Nausea and flushing are dose-dependent and reduce with acclimation after first few uses
Common stacks
Men's wellness
PT-141 for libido, Kisspeptin for hormonal support.