Sable · Question
What is the difference between PT-141 and Sermorelin?
PT-141 is a cyclic heptapeptide melanocortin receptor agonist, a metabolite-like analogue of Melanotan II with a C-terminal acid, used in melanocortin receptor research (cyclic peptide, MW about 1025.2 g/mol).
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Last verified 2026-10-10
What is the difference between PT-141 and Sermorelin?
PT-141 is a cyclic heptapeptide melanocortin receptor agonist, a metabolite-like analogue of Melanotan II with a C-terminal acid, used in melanocortin receptor research (cyclic peptide, MW about 1025.2 g/mol).
Which is heavier, PT-141 or Sermorelin?
PT-141 has a molecular weight of about 1025.2 g/mol and Sermorelin about 3357.9 g/mol (PubChem), so Sermorelin is heavier by 2,332.7 g/mol, a ratio of 3.28. This means 1 mg of PT-141 contains 975.4 nmol versus 297.8 nmol for Sermorelin.
How many mg of Sermorelin are equimolar to 1 mg of PT-141?
1 mg of PT-141 (MW 1025.2) is 975.4 nmol. The same number of moles of Sermorelin (MW 3357.9) weighs 3.275 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of PT-141 and Sermorelin
PubChem lists PT-141 as C50H68N14O10 (1025.2 g/mol) and Sermorelin as C149H246N44O42S (3357.9 g/mol). PT-141 is a cyclic peptide; Sermorelin is a peptide. These formulas refer to the parent compounds without salt counter-ions.
A 10 mg vial of PT-141 equals how many mg of Sermorelin in moles?
10 mg of PT-141 (MW 1025.2) is 9.754 µmol. The same amount of Sermorelin (MW 3357.9) would weigh 32.754 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of PT-141 equals how many mg of Sermorelin in moles?
5 mg of PT-141 (MW 1025.2) is 4.877 µmol. The same amount of Sermorelin (MW 3357.9) would weigh 16.377 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 2 mg vial of Sermorelin equals how many mg of PT-141 in moles?
2 mg of Sermorelin (MW 3357.9) is 0.5956 µmol. The same amount of PT-141 (MW 1025.2) would weigh 0.6106 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of Sermorelin equals how many mg of PT-141 in moles?
5 mg of Sermorelin (MW 3357.9) is 1.489 µmol. The same amount of PT-141 (MW 1025.2) would weigh 1.527 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of Sermorelin equals how many mg of PT-141 in moles?
10 mg of Sermorelin (MW 3357.9) is 2.978 µmol. The same amount of PT-141 (MW 1025.2) would weigh 3.053 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A CoA for every lot; each vial carries a printed lot number that matches it. Ask with the lot number and we send it.
Cite this
Research use only. Not for consumption. No health claims.
Plain
Sable Peptides. (2026). What is the difference between PT-141 and Sermorelin?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/pt-141-vs-sermorelin/#sqa-040456
APA
Sable Peptides. (2026, October 11). *What is the difference between PT-141 and Sermorelin?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/pt-141-vs-sermorelin/#sqa-040456
BibTeX
@misc{sable_#sqa-040456_2026,
author = {{Sable Peptides}},
title = {{What is the difference between PT-141 and Sermorelin?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/pt-141-vs-sermorelin/#sqa-040456}},
note = {Accessed 11 October 2026. CC BY 4.0}
}Badge
<a href="https://www.sablepeptides.co.uk/ref"><img src="https://www.sablepeptides.co.uk/badge/ref.svg" alt="Data: UK Research Peptide Reference — Sable Peptides" width="220" height="40"></a>
Date modified: 2026-10-10