MT-2 (Melanotan 2) vs PT-141 (bremelanotide)
At 10mg, the only strength both sell by the single box, PT-141 is the cheaper per mg: $0.686 per mg against $0.727 (P41, MT10). MT-2 is offered in 1 strength, PT-141 in 1; MT-2 has 1 on the shelf today, PT-141 none.
Prices revised · USD per box of ten · freight included from $1,000 of goods · COA per batch · research use only
What differs between MT-2 and PT-141
The same cyclic frame with one difference at the C-terminus: MT-2 ends in an amide and PT-141 (bremelanotide) in a free carboxylic acid, while the acetylated norleucine start and the lactam ring between the aspartate and lysine side chains are the same in both. That one change is 0.984 in mass, so an average mass read to about one unit cannot tell the two apart; a high-resolution mass can, [M+H]+ at m/z 1024.548 for MT-2 against 1025.532 for PT-141, and the HPLC purity line shows whether a batch of one holds any of the other. Both carry a tryptophan, the residue light ages, so both are kept dark.
| Detail | MT-2 | PT-141 |
|---|---|---|
| Best price per mg | $0.727 per mg (MT10) | $0.686 per mg (P41) |
| Price per box of ten | $72.72 | $68.56 |
| Strengths offered | 1: 10mg | 1: 10mg |
| Dearest price per mg | $0.727 per mg (MT10) | $0.686 per mg (P41) |
| On the shelf today | Yes, its one strength | No, made to order |
| Range | Cosmetic & Skin | Hormone & Reproductive |
| Form | Lyophilised powder | Lyophilised powder |
| Average mass | 1,024.2 g/mol | 1,025.2 g/mol |
| CAS number | 121062-08-6 | 189691-06-3 |
| Release limit | Purity ≥ 98.0 % by RP-HPLC | Purity ≥ 98.0 % by RP-HPLC |
Each line’s own page: MT-2 (Melanotan 2) and PT-141 (bremelanotide). Reading either certificate: how to read a peptide COA. Checking a batch: verify a batch number. Every line priced: the price list. Checking another supplier’s quote: the price per mg calculator.
Strength for strength
Every strength both are offered in, per mg, the lower figure in bold (neither at a tie); stock as this page was opened.
| Strength | MT-2 | PT-141 |
|---|---|---|
| 10mg | $0.727 per mg (MT10, in stock) | $0.686 per mg (lower) (P41, made to order) |
Every strength of both
Compared elsewhere
The same two lines against the others they are usually weighed with.
Questions
What is the difference between MT-2 and PT-141?
The same cyclic frame with one difference at the C-terminus: MT-2 ends in an amide and PT-141 (bremelanotide) in a free carboxylic acid, while the acetylated norleucine start and the lactam ring between the aspartate and lysine side chains are the same in both.
Which is cheaper per mg, MT-2 or PT-141?
At 10mg, the only strength both sell by the single box, PT-141 is the cheaper per mg: $0.686 per mg against $0.727 (P41, MT10).
How do I tell MT-2 and PT-141 apart on a certificate?
By a high-resolution mass. MT-2’s calculated average mass is 1,024.2 g/mol and PT-141’s 1,025.2 g/mol; in electrospray expect m/z 1025.2 and 513.1 (1+ and 2+) for MT-2 against 1026.2 and 513.6 (1+ and 2+) for PT-141. The two are within about one unit of each other, so an average mass cannot tell them apart; a high-resolution mass can, [M+H]+ at m/z 1024.548 for MT-2 against 1025.532 for PT-141, and the HPLC purity line shows whether a batch of one holds any of the other.
Are MT-2 and PT-141 made to the same specification?
Yes: both are supplied to purity not less than 98.0 percent by RP-HPLC and net content within 5 percent of label, and each certificate reports those with a measured mass, read against the calculated figure on each sheet. The retest date is on the batch record. What differs is what each certificate has to look for, which is set by the molecule and described on each compound’s own page.
Structural facts from each compound’s sheet and profile; prices and stock from the list at the moment this page was opened. How to compare strengths on price.