Peptide molecular weights for COA checking
Theoretical masses for 28 research compounds. Each page covers the expected mass-spec ions, what a good COA for that compound shows, and common mix-ups.
AOD-96041,815.08 DaC78H123N23O23S2BPC-1571,419.54 DaC62H98N16O22Cagrilintide4,409.01 DaC194H312N54O59S2CJC-1295 (no DAC)3,367.90 DaC152H252N44O42CJC-1295 (with DAC)3,647.19 DaC165H269N47O46DSIP848.81 DaC35H48N10O15Epitalon390.35 DaC14H22N4O9GHK-Cu340.38 DaC14H24N6O4GHRP-2817.97 DaC45H55N9O6GHRP-6873.01 DaC46H56N12O6Hexarelin887.04 DaC47H58N12O6Ipamorelin711.85 DaC38H49N9O5Kisspeptin-101,302.44 DaC63H83N17O14Melanotan II1,024.18 DaC50H69N15O9MOTS-c2,174.59 DaC101H152N28O22S2NAD+663.43 DaC21H27N7O14P2PT-1411,025.16 DaC50H68N14O10Retatrutide4,731.35 DaC221H342N46O68Selank751.87 DaC33H57N11O9Semaglutide4,113.58 DaC187H291N45O59Semax813.92 DaC37H51N9O10SSermorelin3,357.88 DaC149H246N44O42SSS-31 (Elamipretide)639.79 DaC32H49N9O5TB-500889.01 DaC38H68N10O14Tesamorelin5,135.78 DaC221H366N72O67SThymosin Alpha-13,108.28 DaC129H215N33O55Thymosin Beta-44,963.44 DaC212H350N56O78STirzepatide4,813.45 DaC225H348N48O68
Full reference table
| Compound | Formula | Average MW (Da) | Monoisotopic (Da) |
|---|---|---|---|
| AOD-9604 | C78H123N23O23S2 | 1,815.08 | 1,813.860 |
| BPC-157 | C62H98N16O22 | 1,419.54 | 1,418.704 |
| Cagrilintide | C194H312N54O59S2 | 4,409.01 | 4,406.252 |
| CJC-1295 (no DAC) | C152H252N44O42 | 3,367.90 | 3,365.894 |
| CJC-1295 (with DAC) | C165H269N47O46 | 3,647.19 | 3,645.015 |
| DSIP | C35H48N10O15 | 848.81 | 848.330 |
| Epitalon | C14H22N4O9 | 390.35 | 390.139 |
| GHK-Cu | C14H24N6O4 | 340.38 | 340.186 |
| GHRP-2 | C45H55N9O6 | 817.97 | 817.428 |
| GHRP-6 | C46H56N12O6 | 873.01 | 872.445 |
| Hexarelin | C47H58N12O6 | 887.04 | 886.460 |
| Ipamorelin | C38H49N9O5 | 711.85 | 711.386 |
| Kisspeptin-10 | C63H83N17O14 | 1,302.44 | 1,301.630 |
| Melanotan II | C50H69N15O9 | 1,024.18 | 1,023.540 |
| MOTS-c | C101H152N28O22S2 | 2,174.59 | 2,173.108 |
| NAD+ | C21H27N7O14P2 | 663.43 | 663.109 |
| PT-141 | C50H68N14O10 | 1,025.16 | 1,024.524 |
| Retatrutide | C221H342N46O68 | 4,731.35 | 4,728.472 |
| Selank | C33H57N11O9 | 751.87 | 751.434 |
| Semaglutide | C187H291N45O59 | 4,113.58 | 4,111.115 |
| Semax | C37H51N9O10S | 813.92 | 813.348 |
| Sermorelin | C149H246N44O42S | 3,357.88 | 3,355.819 |
| SS-31 (Elamipretide) | C32H49N9O5 | 639.79 | 639.386 |
| TB-500 | C38H68N10O14 | 889.01 | 888.492 |
| Tesamorelin | C221H366N72O67S | 5,135.78 | 5,132.717 |
| Thymosin Alpha-1 | C129H215N33O55 | 3,108.28 | 3,106.504 |
| Thymosin Beta-4 | C212H350N56O78S | 4,963.44 | 4,960.486 |
| Tirzepatide | C225H348N48O68 | 4,813.45 | 4,810.525 |
Average and monoisotopic masses are calculated from each molecular formula with standard atomic weights and cross-checked against PubChem (or KEGG DRUG for retatrutide). Peptides whose structure or mass could not be confirmed in a public database are not included.