Summary: The PT-141 (bremelanotide) sample on the Longeva hub carries a research use only (RUO) status: it is a synthetic peptide reagent for laboratory protocols, not a finished prescription drug and not Vyleesi.
PT-141 and Vyleesi: reagent versus approved drug
The same peptide, bremelanotide, is the active ingredient of the injectable drug Vyleesi, approved by the FDA in 2019 for hypoactive sexual desire disorder (HSDD) in premenopausal women. Vyleesi is registered, dosed and monitored as a medicine. The Longeva sample is not Vyleesi: it is supplied strictly for laboratory research, with no medical labeling, dosing syringe or patient instructions.
Research context of the melanocortin pathway
PT-141 is described as a synthetic, non-selective melanocortin receptor agonist, primarily at MC3R and MC4R. Research on this class looks at sexual desire and arousal through central neural mechanisms, unlike PDE5 inhibitors (sildenafil, tadalafil), which act on vascular blood flow. That target difference, brain versus vasculature, is a standard point of comparison in the pharmacology literature on libido.
Melanocortin receptors are also studied in skin pigmentation and energy homeostasis, so the same class covers related peptides such as Melanotan II, which acts on the same receptors with a different profile of studied effects.
Sample format and storage
The sample ships with an independent COA report for its batch (LOT). Storage conditions (temperature, protection from light and moisture) are printed on the label; follow your lab's SOP and log the receipt date and transport conditions in your internal batch record.
Verifying a batch against its COA
- Find the LOT number on the vial and outer packaging.
- Open the PDF for this substance in the COA archive.
- Check the substance name, test methods (e.g. HPLC, identity) and result units.
- Record the receipt date and the PDF link in your batch log.
COAs are issued by independent third-party labs. A report confirms analytical results at the time of testing, not the material's medical status.
Further reading
Reference material. Not medical advice. This sample is intended for laboratory research only (RUO). Vyleesi is a trademark of its owner.
