PT-141 (Bremelanotide) is a melanocortin-receptor agonist sold widely on the Australian grey market for sexual-function research. Vendor purity varies enormously and substitution with cheaper melanocortin peptides is common.
Melanocortin receptor agonist
Also known as: Bremelanotide
Why test PT-141?
PT-141 is dose-sensitive - under- and over-filled vials are both common, and the side-effect profile changes substantially with content. LC-MS confirms it isn't actually Melanotan-II, which has a similar mass profile but very different effects.
Common issues we find
Substitution with Melanotan-II (cheaper, related melanocortin)
Under-fill - labelled 10 mg, contains 5-7 mg
Low purity (<92% HPLC) from incomplete synthesis
Frequently asked questions
How do I get PT-141 tested in Australia?
Ship a sealed vial to LabDoc's Australian intake address (emailed to you when you order). We run LC-MS for identity and HPLC for purity, A$549 per vial. COA is delivered in 3-7 business days.
What purity should PT-141 be?
Reference-grade PT-141 is ≥98% by HPLC. Australian grey-market vials commonly come in between 88-96% - anything under 90% is a quality concern.
Can LabDoc tell PT-141 apart from Melanotan-II?
Yes - LC-MS resolves the molecular weights cleanly (Bremelanotide vs Melanotan-II have distinct fragmentation patterns). Identity confirmation is unambiguous.
Is PT-141 the same as Melanotan-II?
No. PT-141 (Bremelanotide) is a metabolite of Melanotan-II, developed specifically for sexual function. Melanotan-II is sold for tanning research. Their effects, side-effect profiles, and durations differ.
How much does PT-141 testing cost?
A$549 per vial - covers LC-MS identity, HPLC purity, quantitative content, signed COA, and optional publication on labdoc.org. Endotoxin (+A$300, send a second vial) and contaminants (+A$200) are optional add-ons per vial.