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PT-141

PT-141 at a glance

Peptide.Express PT-141 10mg (CAS 189691-06-3) is $55, ≥99% pure by HPLC, with a molecular weight of 1025.2 Da and molecular formula C50H68N14O10, third-party tested with a lot-matched Certificate of Analysis you can verify before purchase. Ships same day on US orders placed before 2 PM EST, free over $150. For in-vitro laboratory research use only.

PT-141 — research-grade lyophilized peptide vial from Peptide.Express, ≥99% HPLC purity
≥99% PurityUS SynthesizedOut of Stock

For laboratory research use only. Not for human or veterinary use.

Research-Grade Compound

PT-141 (bremelanotide) is a synthetic cyclic heptapeptide that acts as a melanocortin receptor agonist, with its principal research activity at the MC3R and MC4R subtypes expressed in the central nervous system. Molecular formula C50H68N14O10, molecular weight 1,025.2 Da, CAS 189691-06-3. Structure: Ac-Nle-cyclo(Asp-His-D-Phe-Arg-Trp-Lys)-OH.

Purity standard: PT-141 is sourced to ≥99% by HPLC — sourcing spec.

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10mg · $55.00/vial

$55.00$65.00USD / Unit
1

Certificate of Analysis

No variant-specific CoA for 10mg — showing the product CoA.

View CoAVerify with testing laboratory
HPLC VerifiedIdentity & purity
CoA Every OrderLot-matched
Ships Same DayBefore 2 PM EST
Free US ShipOrders over $150
No variant-specific CoA for 10mg — showing product CoA
Certificate Details
Purity (measured)Not recorded
Sourcing spec≥99% by HPLC
Methodology
HPLCLC-MS/MS
CAS Number189691-06-3
Molecular FormulaC50H68N14O10
Molecular Weight1025.2 g/mol
SequenceAc-Nle-cyclo(Asp-His-D-Phe-Arg-Trp-Lys)-OH (melanocortin agonist)
Verify Results with Testing Laboratory

Issued by an independent third-party laboratory; Peptide.Express does not test in-house. Results are reproduced as-is and confirm compound identity, purity, and the analytical methods used. For questions about specific results, contact support@peptide.express.

Safety Data Sheet (SDS)
≥99% by HPLCLC-MS/MS VerifiedCoA Every BatchIn-Vitro Research Use Only

PT-141 Specifications

Identity, purity and storage specifications for PT-141.
CompoundPT-141 (bremelanotide)
CAS189691-06-3
Molecular formulaC50H68N14O10
Molecular weight1,025.2 Da
SequenceAc-Nle-cyclo(Asp-His-D-Phe-Arg-Trp-Lys)-OH
Purity≥99% by HPLC
FormLyophilized powder
Storage (lyophilized)-20°C, desiccated, protected from light
Storage (reconstituted)2–8°C, use within 14–28 days

Reconstituting PT-141: step-by-step peptide reconstitution guide. Concentration maths: peptide reconstitution calculator.

Buying PT-141 — Frequently Asked Questions

What purity standard does Peptide.Express use for PT-141?

≥99% by reverse-phase HPLC, with LC-MS/MS confirming the 1,025.2 Da molecular weight. The mass confirmation matters more than usual with this compound, because Melanotan II sits only about 1 Da away.

Where is the Certificate of Analysis for PT-141?

On this page and in the Peptide.Express lab results library. Each CoA is batch-specific and lists HPLC purity, LC-MS/MS mass confirmation, endotoxin result, testing laboratory and test date.

What testing does PT-141 undergo before shipping?

Reverse-phase HPLC for purity by area under curve, LC-MS/MS for molecular weight identity, LAL endotoxin testing, and visual QC for appearance and particulate matter. Testing is performed by an independent third-party laboratory and the results are issued as a batch-specific Certificate of Analysis.

How should PT-141 be stored before and after reconstitution?

Lyophilized: -20°C, desiccated and protected from light, stable for 24 months from manufacture. Reconstituted: 2–8°C, used within 14–28 days. Do not freeze the reconstituted solution and avoid repeated freeze-thaw cycles.

Is PT-141 FDA approved?

Bremelanotide is FDA-approved as Vyleesi for hypoactive sexual desire disorder in premenopausal women. That approval applies to the specific finished drug product, not to research-grade material, which is not approved for human use and is sold here for in-vitro laboratory research only.

PT-141 research reference

Research Compounds Related to PT-141

Melanotan IIThe non-selective parent structure, differing only in its C-terminal carboxamide.Kisspeptin-10GPR54 agonist acting on a separate hypothalamic axis, used where the research question is GnRH rather than melanocortin signalling.DSIPEndogenous nonapeptide studied in CNS and neuroendocrine models with no identified receptor.EnclomipheneSmall-molecule SERM used in HPG-axis feedback research — not a peptide.

All products are sold for in-vitro laboratory research use only. Not intended for human consumption, clinical use, or veterinary use. Peptide.Express makes no medical claims. Consult the published literature for research application guidance.

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