Name: PT-141 (Bremelanotide) 10mg (10 Vials / Kit)
Brand: HK Peptide
SKU: HK-P41
Price: 55.00 USD
Availability: InStock

PT-141 (Bremelanotide) at a glance

Bremelanotide, widely known by its development code PT-141, is a cyclic heptapeptide with the formula C50H68N14O10 and a molecular weight of 1025.2 g/mol. It is a close relative of Melanotan II: the two share a lactam-bridged ring, but bremelanotide ends in a free carboxylic acid where Melanotan II carries an amide. Palatin Technologies developed it after observations made during Melanotan II research pointed toward effects on sexual function.

Price and availability

HK Peptide lists this kit of 10 vials at 10mg each (100 mg in total), shipped from Hong Kong, Hong Kong. $55.00 buys the whole kit, which is $0.55/mg. Of the 13 PT-141 (Bremelanotide) listings on the marketplace, from 13 brands, this is the 2nd-lowest price per mg. Checkout goes into escrow first; the funds move to HK Peptide once delivery is confirmed.

This listing: HK Peptide PT-141 (Bremelanotide)

Brand: HK Peptide
Kit: 10 vials × 10 mg (100 mg in total)
Price per vial: $5.50
Price per mg: $0.55
Also sold by: Jinlu Peptides 10mg $171.00 · BioPepta 10mg $57.00 · European Peptide Sciences 10mg $300.00 · SSRBIO 10mg $57.00 · Lianhua Peptide Co. 10mg $57.00 · Sulan Bio 10mg $60.00

Lab testing

HK Peptide published a Janoshik #106004 report for this compound. Test: Purity & Content (HPLC). Result: 99.91% purity · 10.73 mg. Tested Feb 9, 2026. Verification key QK7MHVGZMV2K can be checked at janoshik.com.

View the report · How to read it (Testing 101) · Every report for this compound

Bought through escrow: the brand is only paid after you confirm delivery. If the parcel never arrives, or an independent test shows the wrong compound or a significant under-fill, open a claim before releasing payment.

What it is studied for

PT-141 is described as an agonist at several melanocortin receptors, with interest centered on MC4R and, to a lesser degree, MC3R in the brain. MC4R neurons in the hypothalamus and connected circuits are thought to influence motivation and sexual responses, and bremelanotide's effects are generally attributed to that central route rather than to direct action on blood vessels. It retains some MC1R activity, which has been linked to localized skin darkening reported in clinical studies, where nausea and transient blood-pressure rises were also documented.

Research and regulatory status

Bremelanotide is approved by the US FDA as a prescription medicine for acquired, generalized hypoactive sexual desire disorder in premenopausal women, on the basis of late-stage clinical trials. An earlier intranasal version was halted over blood-pressure findings. Outside that approved use, researchers employ the peptide to probe melanocortin pathways in appetite and behavior. Material sold for research is a separate preparation and has no connection to the approved product's regulatory status.

Checking the lab data

Mass spectrometry should show a mass consistent with 1025.2 g/mol. Because PT-141 and Melanotan II differ only at the C-terminus, about one mass unit apart, a high-resolution measurement or a reference retention time helps rule out mislabeled material. HPLC purity should be reported from a lot-specific trace. The lyophilized cake is typically white and compact. Look for an independent lab, a test date and a batch number on the report.

This listing has an independent lab report attached; the testing panel above summarises what the tested sample contained against its label.

Listing details

Compound: PT-141 (Bremelanotide)
Synonyms: Bremelanotide
Class: Melanocortin receptor agonist
Format: Lyophilized (freeze-dried) powder
Molecular formula: C50H68N14O10
Molecular weight: 1025.2 g/mol
Vial strength: 10mg
Vials per kit: 10
Total content: 100 mg
Price per mg: $0.55
Sold by: HK Peptide
Ships from: Hong Kong, Hong Kong
Lab report: Independent report attached

Storage and preparation

Keep unopened freeze-dried vials cold, sealed and out of the light; moisture is what degrades a lyophilized cake fastest. After reconstitution, refrigerate the solution and work within the stability window your protocol sets.

Concentration arithmetic: one 10 mg vial dissolved in 2 mL gives 5 mg/mL, or 10 mg/mL in 1 mL. The Research Lab calculator in your dashboard handles any other volume.

Buyer questions

Why is PT-141 described as acting centrally?

Studies place its main site of action at melanocortin receptors in the brain, particularly MC4R in hypothalamic circuits, rather than at vascular smooth muscle. That distinguishes it from compounds that work by changing blood flow, and it is why bremelanotide research sits within neuroscience as much as reproductive medicine.

Can a lab report tell PT-141 apart from Melanotan II?

Yes, if the method is precise enough. The two peptides have nearly identical sequences, but the free acid in PT-141 versus the amide in Melanotan II produces a small mass difference and usually a shift in HPLC retention time. A report that lists both observed mass and retention gives better assurance.

How much PT-141 (Bremelanotide) is in this listing?

10 vials of 10mg each — 100 mg in all. Where a lab report exists, the testing panel above shows what the brand's tested sample actually measured.

When does HK Peptide get paid?

Only after you confirm delivery. Until then the payment is held in escrow, and you can open a claim if anything is wrong with the order.

Supplied for laboratory research only. Not for human or veterinary use, and not a substitute for any prescription medicine. Nothing on this page is medical advice.