Buy Melanotan II (MT-II) Peptide

Melanotan II is a cyclic peptide engaging the melanocortin receptor family, whose subtypes are distributed across several tissue types with distinct associated physiology. Supplied lyophilised, 10mg per vial at $3.50 per mg. It is not notably selective within that family, so a broad profile follows directly from where the receptors sit rather than from any defect. Verification differs from a linear peptide in kind: the characteristic failure is incomplete cyclisation, and the uncyclised form differs by too small a mass for spectrometry alone to resolve, so the chromatographic trace is the document that answers the question. Research use only.

Best MT-1 – 10mg

MT-1 is a linear melanocortin-receptor peptide, supplied lyophilised at 10mg per vial, which is $3.50 per mg. Being linear rather than cyclic changes its characteristic manufacturing failure: where a cyclic peptide can be left with an unclosed precursor that mass spectrometry struggles to separate, a linear chain fails by omitting a residue, producing a plainly different mass that competent analysis flags immediately. Neither this compound nor its cyclic neighbours has a widely circulated reference standard, which places more weight than usual on the identity of the analysing laboratory. Research use only.

Best PT-141 – 10mg

PT-141 is a cyclic melanocortin-receptor peptide drawn from the same structural lineage as Melanotan II but engaging the family more narrowly. Supplied lyophilised, 10mg per vial at $4.50 per mg. Narrower engagement means an observed result carries fewer candidate explanations, which suits a subtype-specific question and disadvantages one framed at the level of the family as a whole. As with any cyclic peptide the manufacturing step most likely to be left incomplete is ring closure, and the open-chain precursor sits too close in mass to separate by spectrometry alone, so ask for the chromatographic trace rather than the headline purity figure. Research use only.