What PT-141 is
PT-141 is a cyclic heptapeptide derived from the alpha-MSH sequence. It acts at melanocortin receptors, principally MC3 and MC4, which is a different mechanism from the vascular compounds it is often compared with. It is a metabolite of melanotan II, developed separately.
How the pen is supplied
Solution in a sealed 3 ml pen graduated in 300 dial units.
Pen specification
| Class | Melanocortin receptor agonist |
| Also known as | Bremelanotide |
| Content | 10 mg |
| Fill volume | 3 ml |
| Dial graduation | 0.01 ml per unit |
| Total dial units | 300 |
| Per dial unit | 33 mcg |
| Cost per mg | £4 per mg |
Milligrams per dial unit and cost per milligram are calculated from the pen strength, its fill volume and the current live price. Every SerenQ pen is graduated at 0.01 ml per unit.
Verification
Independent HPLC per batch, identifier printed on the pen.
- SerenQ PT-141 10mg Peptide Penout of stock£40
Availability checked 2026-09-04. The product page carries live stock.
Common questions
Is PT-141 related to melanotan II?
Yes. PT-141 is a metabolite of melanotan II that was developed as a separate compound. They share the melanocortin mechanism but differ in receptor selectivity.