MSH Analogues

CAS189691-06-3

FormulaC50H68N14O10

Mol. weight1025.17 Da

Quantity10mg/vial

Purity99.1% HPLC

IdentityConfirmed

ReportBy email on request

StockIn stock

PT-141 10mg

Name: PT-141 10mg
Brand: Pepta Labs
SKU: pt-141
Price: 39.76 USD
Availability: InStock

Bremelanotide (INN), PT141, PT 141, Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH · CAS 189691-06-3

This listing is a single sealed glass vial holding a supplier-stated 10 mg of PT-141 (also written PT141 or PT 141) as dry lyophilized powder, sold by Pepta Labs as a laboratory reference material, not for human or animal use. The 10 mg vial is the only PT-141 size Pepta Labs lists. The independent HPLC purity and mass-spectrometry identity report for the sampled production run is sent by email on request, before you order if you want to see it: use the request form on this page or email support@peptalabs.com.

PT-141 10mg: $39.76 per vial ($3.98 per mg of the supplier-stated 10 mg). Ships to US addresses only. PT-141 10mg (Bremelanotide) is a lyophilized research peptide supplied as 10mg of dry powder per sealed vial. CAS 189691-06-3; molecular formula C50H68N14O10; molecular weight 1025.17 Da. Purity is reported as 99.1% by reversed-phase HPLC and identity is confirmed by mass spectrometry; the analytical report is available by email. Supplied for laboratory research use only.

99.1% pure Identity confirmed

$39.76

$3.98 per mg

Free US shipping · Most orders ship the next business day

Pack size and price

Quantity

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Code FALL25: 25% off at checkout.

Free US shipping, no minimum

Most orders ship the next business day as dry powder at ambient temperature. Unopened products in original sealed condition may be returned within 30 days of delivery with return authorization.

Report by email before you order

Independent HPLC purity and MS identity report on request. Pepta Labs does not test in-house.

Payment methods

Pepta Labs accepts Cash App, Venmo, Zelle, Bitcoin and Ethereum (5% crypto discount). Payment instructions are emailed as soon as you place your order.

Research use only

Not for human or animal use. Certified at checkout from a registered account.

Specifications

PT-141 10mg at a glance

PT-141 10mg is supplied as lyophilized powder in a sealed glass vial for laboratory research only. It is not for human or animal use, consumption, administration, diagnosis or treatment.

Full name: Bremelanotide
Quantity: 10mg/vial
CAS number: 189691-06-3
Molecular formula: C50H68N14O10
Molecular weight: 1025.17 Da
Sequence: Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH (lactam between Asp2 side-chain carboxyl and Lys7 side-chain amine)
Purity: 99.1% by HPLC
Identity: Confirmed by mass spectrometry
Physical form: Lyophilized (freeze-dried) powder, sealed glass vial
Report: Sent by email on request, before you order if you want to see it first.
Not claimed: Sterility, endotoxin or LAL, potency, pharmaceutical-grade, cGMP, contaminant-panel or vial fill-quantity testing
Category: MSH Analogues

Chemical identity

What PT-141 is

PT-141 (INN bremelanotide) is a synthetic cyclic heptapeptide, Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH, with a lactam bridge between the Asp2 side-chain carboxyl and the Lys7 side-chain amine. It is the C-terminal carboxylic-acid analogue of Melanotan-II: the two share the same seven residues, N-acetyl norleucine and D-Phe4, and differ only at the C-terminus (free acid in PT-141, primary amide in Melanotan-II). It contains no cysteine and therefore no disulfide bond. Molecular formula C50H68N14O10, molecular weight 1025.17 Da (average), CAS 189691-06-3, UNII 6Y24O4F92S, PubChem CID 9941379. Pepta Labs lists PT-141 as a lyophilized powder in sealed glass vials at 10 mg per vial, with reported RP-HPLC purity and identity confirmed by mass spectrometry; the salt form is typically acetate or trifluoroacetate. Store sealed vials at 2-8 C on arrival or -20 C for long-term storage, away from light and moisture. For laboratory research use only.

Also known as: Bremelanotide (INN), PT141, PT 141, Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH
Structural class: synthetic cyclic heptapeptide with a side-chain lactam bridge (Asp2-Lys7), N-acetyl norleucine at the N-terminus and a C-terminal carboxylic acid
Residues: 7 amino acids
Salt form: typically supplied as acetate or trifluoroacetate salt
PubChem CID: 9941379
UNII: 6Y24O4F92S

Handling

Storage, form and restrictions

Shipping: Ships at ambient temperature with no cold pack and no insulated packaging. No cold chain is required for dry powder.
Storage: Refrigerate at 2–8°C on arrival, or hold at −20°C for long-term storage. Keep sealed vials away from light and moisture.
Research use only: Offered solely for laboratory research. Not for human or animal use, consumption, administration, diagnosis or treatment. See the research use policy.

Documentation

Before you order

What are research peptides? PT-141 (Bremelanotide): Cyclic Structure, CAS Records, Salt Form and Expected Mass All MSH Analogues compounds How to Read a Peptide COA HPLC and Mass Spectrometry Testing and Documentation Research Use Policy

Questions

PT-141 10mg — common questions

What sizes of PT-141 does Pepta Labs sell?

One: the 10 mg vial on this page. No other PT-141 fill size is listed, and multi-vial packs contain the same 10 mg vial.

What exactly is in the PT-141 10mg vial?

A supplier-stated 10 mg of PT-141 peptide as dry, freeze-dried (lyophilized) powder in a sealed glass vial, with no liquid added. Fill quantity is not independently tested, and the analytical report states purity and identity, not the peptide content of an individual vial.

What salt form is PT-141 supplied as?

PT-141 is typically supplied as an acetate or trifluoroacetate (TFA) salt. The counter-ion is part of the powder in the vial but not part of the peptide formula C50H68N14O10. If the counter-ion matters for your work, ask about it when you request the report.

Is PT-141 10mg lab tested, and how do I get the HPLC and mass spec report?

Yes, at the production-run level: an independent third-party lab tested a sample of the run this listing is sourced from, for RP-HPLC purity (area-%) and mass-spectrometry identity. Pepta Labs does not test in-house and vials carry no lot number, so the report covers the sampled run, not an individual vial. Request it on this page or email support@peptalabs.com with PT-141 10mg; it is sent by email, before you order if you want it.

How should sealed PT-141 powder be stored?

Keep the sealed vial of dry powder at 2-8 °C on arrival, or at -20 °C for long-term storage, away from light and moisture. It ships as dry powder at ambient temperature without a cold pack. The Learn guide on storage temperature and handling of lyophilized research peptides covers the details.

Where can I read more about PT-141 before ordering?

The Learn guide How to Read and Verify a Peptide Certificate of Analysis (COA) explains each field of an HPLC and mass spectrometry report, and the guide HPLC vs Mass Spectrometry: How Peptide Purity and Identity Are Tested explains why both are reported. PT-141's identity data (CAS, formula, sequence) are listed on this page.

What does PT-141 10mg cost?

PT-141 10mg starts at $39.76 per vial. 3-vial packs are 7% off and 5-vial packs are 14% off. US shipping is free with no minimum.

What payment methods are accepted?

Pepta Labs accepts Cash App, Venmo, Zelle, Bitcoin and Ethereum (5% crypto discount). Payment instructions are emailed as soon as you place your order.

Is this for human or animal use?

No. PT-141 10mg is offered solely for laboratory research and is not for human or animal use, consumption, administration, diagnosis or treatment. Buyers certify this at checkout.

Is PT-141 the same as bremelanotide?

Yes. Bremelanotide is the INN/USAN for PT-141, the cyclic heptapeptide Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH (C50H68N14O10, 1025.17 Da, CAS 189691-06-3, UNII 6Y24O4F92S).

How does PT-141 differ from Melanotan-II?

Only at the C-terminus: PT-141 has a free carboxylic acid (C50H68N14O10, 1025.17 Da), while Melanotan-II has a primary amide (C50H69N15O9, 1024.18 Da). The formulas differ by one nitrogen and one oxygen, the masses by about 1 Da, and the CAS numbers are 189691-06-3 and 121062-08-6 respectively.

What does the CAS number 189691-06-3 identify?

It is the Chemical Abstracts Service registry number for the free PT-141 (bremelanotide) peptide. Salt forms such as the acetate are registered separately.

All MSH Analogues compounds →