Specification sheet
PT-141 (bremelanotide)
Document IP-SPEC-P41, specification revised 3 October 2026, printed 4 October 2026 by International Peptides, intlpeptides.com. Prices revised 2 October 2026. The certificate of analysis for a batch reports its purity, net content and identity by mass spectrometry; the other limits are the specification the compound is supplied to.
Identity
| Product | PT-141 (bremelanotide) |
|---|---|
| Class | N-acetylated cyclic lactam heptapeptide with a C-terminal free acid (bremelanotide) |
| CAS number | 189691-06-3 |
| Formula | C50H68N14O10 |
| Average mass | 1025.18 g/mol |
| Form | Lyophilised powder |
| Pack | 10 sealed vials of one strength, batch number on vial, carton and packing list |
| Range | Hormone & Reproductive |
| Codes | P41 |
Strengths and prices
| Code | Strength | Per box, USD | Per vial | Availability |
|---|---|---|---|---|
| P41 | 10mg x 10 vials | $68.56 | $6.86 | Made to order, 2 weeks |
Specification limits
| Purity | ≥ 98.0 % (RP-HPLC, 220 nm, area normalisation) |
|---|---|
| Identity | Retention time vs reference standard; ESI-MS |
| Any single related substance | ≤ 1.0 % |
| Water | ≤ 8.0 % (Karl Fischer) |
| Acetate | ≤ 15.0 % (ion chromatography), as the acetate salt |
| Residual solvents | Acetonitrile ≤ 410 ppm; TFA ≤ 1.0 % |
| Net content | Label claim ± 5 % |
| Closure | 2 mL glass vial, bromobutyl stopper, aluminium flip-off seal |
| Storage | −20 °C, dark and dry; brief ambient transit tolerated |
| Shelf life | 24 months from manufacture; retest date on the batch record |
Batch numbers
A batch number reads form, month of manufacture, product code, batch sequence: for example, L2607-RT30-0002 is a lyophilised batch of RT30 made in July 2026, the second batch. The same number is on the vial, the carton, the packing list and the certificate, and any of them can be checked at https://intlpeptides.com/coa. Retained samples of every batch are held for twelve months from dispatch.
Terms of supply
Sold to trade accounts by the sealed box, priced in USD per box before any sales tax, freight included from $1,000 of goods, DAP, delivered in the United States, shipped from the United States. On-shelf lines leave in 1 to 2 business days after payment clears; made-to-order lines in about two weeks; a special-order line is brought in on a 50-box minimum rather than held in stock. Paid against a proforma invoice in Bitcoin or USDT. Research chemical for laboratory use in vitro; not for human or animal consumption. The full terms: https://intlpeptides.com/terms.
International Peptides, 2810 Crossroads Dr #4200, Madison, WI 53718, United States. +1 646-847-1895. orders@intlpeptides.com. https://intlpeptides.com/peptides/pt-141-bremelanotide