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PT-141 Peptide · 10 mg
PT-141 peptide from TrueBond Labs is made in the USA, and the certificate for our published lot, from an independent US lab, is filed by lot code so you can read it before you order.
- Third-party HPLC purity tested
- Lot COA published in full
- Same-day weekday shipping before 2PM ET
Ships as lyophilized powder for laboratory research use.
Lab report · 99.86% HPLCLot LD07272026-5 · identity confirmedIndependent lab, reported Sep 25, 2026Need 10+ vials? Email sales@truebondlabs.com for wholesale pricing.
This lot’s certificate, not our word for it
Lab reportViewCertificate of analysis Report 2609AFL1749.5963
PT-141 10 mg
Look up the lot code from your vial on Lab Reports. If it’s published, its certificate opens there.
Why buy PT-141 Peptide from TrueBond Labs
Our PT-141 lab certificate
Our published PT-141 lot was tested by an independent third-party lab that confirmed identity and reported HPLC purity of at least 99%. Read the full PT-141 certificate of analysis and compare its lot code with the one on your vial.
A cyclic peptide in one 10mg size
PT-141 is a cyclic peptide of seven amino acids, supplied as 10mg of lyophilized powder in a sealed 3 mL vial. It's the only size we stock, and its lot code is printed on the label.
PT-141 or Melanotan 2
PT-141 is a close relative of Melanotan 2, and the two are often compared. We sell each as its own product with its own lot code. PT-141 is listed on our third-party tested peptides page with every other published lot.
What is PT-141 Peptide?
PT-141 is a synthetic cyclic peptide of seven amino acids and an analogue of alpha-MSH. It appears in published laboratory research on melanocortin receptor biology. Its sequence is written Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH, with the ring closed by a lactam bridge between aspartic acid and lysine.
It shares its six-residue ring with Melanotan 2. The two differ at one end of the chain: PT-141 ends in a free carboxylic acid, and Melanotan 2 ends in an amide. That one change is enough to make them distinct compounds with separate catalog listings and certificates.
All information is provided for educational context on laboratory research only and is not a claim of therapeutic effect. This product is not for human or animal use.
What you get from TrueBond
Documentation you can check for yourself, lot by lot.
Browse every published certificate- Certificates published by lot code
Each published certificate is posted in full on Lab Reports, as the lab issued it.
- Third-party HPLC purity testing
Run by an independent US laboratory, not in house.
- Lot code on the vial
Search it on Lab Reports to open that lot's certificate once it's published.
- 99% or higher HPLC purity on every published lot
The figure is the outside lab's, as printed on each certificate.
- US-based support
We reply within one business day.
Product & terms of sale
Contents
PT-141 (10 mg), supplied as lyophilized powder for laboratory research applications.
Intended use
This product is sold strictly for in-vitro laboratory research by qualified professionals. It is not for human or animal consumption, and no usage instructions are provided or implied.
Legal disclaimer
Not evaluated or approved by the FDA. Nothing on this page constitutes a claim of therapeutic, diagnostic, or preventive benefit. See our full research disclaimer.
Terms of sale
By purchasing, you affirm you are a qualified researcher (21+) and accept our Terms & Conditions and research-use-only requirements.
PT-141 Peptide: frequently asked questions
What is PT-141?
PT-141 is a synthetic cyclic peptide of seven amino acids in the melanocortin peptide family. We sell it as a 10mg lyophilized vial for laboratory research use only, not for human or animal use.
What is the difference between PT-141 and Melanotan 2?
They're close relatives built on the same six-residue ring. The difference is at the very end of the chain: PT-141 ends in a free carboxylic acid, and Melanotan 2 ends in an amide. We sell them as separate products, each with its own vial and lot code.
Is PT-141 cyclic or linear?
Cyclic. Six of its seven residues form a ring, closed by a lactam bridge between aspartic acid and lysine. The seventh, an acetylated norleucine, sits outside the ring at the start of the chain. Melanotan 2 has the same ring and differs only at the far end.
How do I check the certificate for my PT-141 vial?
Find the lot code printed on your vial label, then look it up on our lab reports page. If it's listed, the certificate under that code covers your lot, and you can open the full PDF to read the test date and purity figure as printed.
How should I store PT-141?
Put the sealed vial in a freezer at −20°C (−4°F) as soon as it arrives. Stored that way, lyophilized PT-141 lasts 24 months or more. Keep it away from light and avoid repeated freezing and thawing.
Where can I buy PT-141 online in the USA?
You can buy it right here. Weekday orders placed before 2PM ET ship the same day from Fort Lauderdale, Florida by USPS with tracking, to US addresses only. Checkout is open to guests, or a free research account gets you a one-time discount on your first order. Buyers must be 21 or older.