Are Melanotan I and Melanotan II the same vial?

No. They are different sequences with different shop URLs and different research framing. A certificate for one does not document the other, and neither documents PT-141.

Glossary · 2026-09-24

Scientific lead: Alice Kay, Ph.D.

Melanocortin receptor ligand, laboratory term

Melanocortin receptors (MC1R through MC5R) are G protein-coupled receptors for peptides processed from pro-opiomelanocortin, including alpha-MSH and ACTH. A melanocortin ligand is a sequence studied at one or more of those receptors. For the class note, see melanocortin ligands. The cellular category hub files these SKUs beside matrix peptides. Shared navigation is not shared identity.

Live, distinct URLs are Melanotan I, Melanotan II, PT-141, and KPV. KPV is the Lys-Pro-Val tripeptide from the C-terminus of alpha-MSH, not a full-length melanocortin analogue. None of these pages is a tanning product or a personal-use note.

Frequently asked questions

Are Melanotan I and Melanotan II the same vial?: No. They are different sequences with different shop URLs and different research framing. A certificate for one does not document the other, and neither documents PT-141.

Research use only. BlueNex Labs does not provide medical or veterinary advice. Confirm your institution’s policies before purchase. How a comparison or class note is checked sits on documentation standards. The biochemist of record is Alice Kay, Ph.D.