Certificates of Analysis › PT-141 (Bremelanotide)
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PT-141 (Bremelanotide) COA & Specifications

Third-party certificate of analysis and chemical specifications for PT-141 (Bremelanotide), a cyclic heptapeptide, in 10 mg lyophilized vials.

Last updated 27 September 2026

Specifications

MaterialPT-141 / Bremelanotide (cyclic heptapeptide)
CAS number189691-06-3
Molecular formulaC50H68N14O10
Molecular weight1025.18 g/mol
SequenceAc-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH
Physical formLyophilized powder
Vial sizes10 mg
Purity specification≥ 98% by HPLC
Storage−20 °C, protected from light

Certificates of analysis

PT-141 10 mg — Lot KIZEN72826-81826v3

LaboratoryOptiq Health Labs (Santa Ana, CA)
Sample ID0943.OPT.260820
Received / reported20 Aug 2026 / 29 Aug 2026
Identity (LC-MS)PT-141 (Bremelanotide) confirmed
Assay (HPLC)9.93 mg per vial
Purity (RP-HPLC)99.6% (specification ≥ 98.0%)
Endotoxin (LAL)Pass (≤ 0.05 EU/mg)
Sterility (USP <71>)Pass (no growth)

View the full certificate (PDF)

Certificates on this page are third-party analytical reports supplied with the research materials we stock. Progressive Bioscience reviews this documentation against the product identity, specification and material received before inventory is released for sale. Reports are published where applicable. For questions about the documentation for your order, email contact@progressivebioscience.com with your order number.

Reading these results

  • Identity (LC-MS) confirms the material’s molecular mass matches PT-141 (Bremelanotide).
  • Assay is the measured amount per vial: 9.93 mg against a 10 mg label.
  • Purity (RP-HPLC) is the main peak as a percentage of all detected material: 99.6%.
  • Endotoxin and sterility are standard laboratory quality screens reported by the testing lab.

Verifying a certificate

Each Optiq Health Labs certificate carries a sample ID and a QR code that links to the lab’s own verification page. Compare the sample ID (0943.OPT.260820), lot number and results shown there with the certificate.

Frequently asked questions

What is the CAS number of PT-141 (Bremelanotide)?

The CAS number for Bremelanotide (PT-141) is 189691-06-3.

What is the molecular weight of PT-141?

PT-141 has the molecular formula C50H68N14O10 and a molecular weight of 1025.18 g/mol.

What is the structure of PT-141?

A cyclic heptapeptide: Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH.

What purity is your PT-141?

Our specification is 98% or higher by HPLC. The current certificate reports 99.6% (lot KIZEN72826-81826v3, Optiq Health Labs, 29 Aug 2026).

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COA documentation confirms analytical characterization for research verification. It does not authorize or imply any human, veterinary, clinical or therapeutic use. PT-141 (Bremelanotide) is sold for laboratory research use only and is not a drug, food, dietary supplement, cosmetic or medical device.
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