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PT-141

PT-141 at a glance

Peptide.Express PT-141 10mg (CAS 189691-06-3) is $55, ≥99% HPLC as the sourcing specification — not a measurement of any one vial — with a molecular weight of 1025.2 Da and molecular formula C50H68N14O10; measured purity and mass are only on that lot’s Certificate of Analysis you can verify before purchase. Same-day dispatch on business days (orders 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 sourcing specification
≥99% HPLC SpecUS 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. That is the specification every batch must meet, not a measurement of any one vial — the measured figure for a batch is on that batch's Certificate of Analysis.

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10mg · $55.00/vial

$55.00$65.00ListUSD / Unit
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Certificate of Analysis

No certificate on file yet for 10mg.

We do not show another size's Batch or accession here. Select a size with a published CoA, or check back once this presentation's lab report is posted.

≥99% HPLC SpecSourcing specification
CoA Where On FileThird-party CoA
Free US ShipOrders over $150
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Safety Data Sheet (SDS)
Catalog identity reference

Theoretical identity from the catalog or verified registry record — not a laboratory observation from the Certificate of Analysis above.

CAS Number189691-06-3
Molecular FormulaC50H68N14O10
Molecular Weight1025.2 g/mol
SequenceAc-Nle-cyclo(Asp-His-D-Phe-Arg-Trp-Lys)-OH (melanocortin agonist)
≥99% HPLC sourcing specResearch use only

PT-141 price per mg

PT-141 sizes, single-vial and pack prices, price per mg, lot number, measured HPLC purity and Certificate of Analysis link
Size1-vial pricePack prices$/mgLot #Measured HPLC %CoA
10mg$55.00—$5.50Pending CoAPending CoAPending CoA

$/mg is the single-vial price divided by the labeled mg per vial. Lot and measured HPLC are listed only when that size's own Certificate of Analysis is on file. All certificates are in the lab results index. For laboratory research use only.

PT-141 Specifications

PT-141 (CAS 189691-06-3) is studied in in-vitro and animal models via Cyclic heptapeptide melanocortin receptor agonist (MC3R/MC4R). This section covers the composition and analytical specification data. Analytical standard: ≥99% by HPLC. Stocked material is for laboratory research use only. Identity, structure, and handling values come from the existing profile.

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% HPLC specification
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?

Sourced to a ≥99% HPLC specification. Where a certificate reports a mass, compare it with 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. Sourced against a ≥99% HPLC purity specification. Third-party Certificates of Analysis are published where on file.

What testing does PT-141 undergo before shipping?

Where a certificate is on file, it shows the assays that laboratory reported. Those can include reverse-phase HPLC, LC-MS/MS, an endotoxin result, and visual QC. A missing line is not a pass and is not proof the assay never ran.

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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