Sable · Question
What is the difference between PT-141 and Tesamorelin?
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).
Research use only. Not for human consumption. No health claims.
Last verified 2026-10-10
What is the difference between PT-141 and Tesamorelin?
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 Tesamorelin?
PT-141 has a molecular weight of about 1025.2 g/mol and Tesamorelin about 5136 g/mol (PubChem), so Tesamorelin is heavier by 4,110.8 g/mol, a ratio of 5.01. This means 1 mg of PT-141 contains 975.4 nmol versus 194.7 nmol for Tesamorelin.
How many mg of Tesamorelin 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 Tesamorelin (MW 5136) weighs 5.01 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of PT-141 and Tesamorelin
PubChem lists PT-141 as C50H68N14O10 (1025.2 g/mol) and Tesamorelin as C221H366N72O67S (5136 g/mol). PT-141 is a cyclic peptide; Tesamorelin 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 Tesamorelin in moles?
10 mg of PT-141 (MW 1025.2) is 9.754 µmol. The same amount of Tesamorelin (MW 5136) would weigh 50.098 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 Tesamorelin in moles?
5 mg of PT-141 (MW 1025.2) is 4.877 µmol. The same amount of Tesamorelin (MW 5136) would weigh 25.049 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 2 mg vial of Tesamorelin equals how many mg of PT-141 in moles?
2 mg of Tesamorelin (MW 5136) is 0.3894 µmol. The same amount of PT-141 (MW 1025.2) would weigh 0.3992 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of Tesamorelin equals how many mg of PT-141 in moles?
10 mg of Tesamorelin (MW 5136) is 1.947 µmol. The same amount of PT-141 (MW 1025.2) would weigh 1.996 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of Tesamorelin equals how many mg of PT-141 in moles?
5 mg of Tesamorelin (MW 5136) is 0.9735 µmol. The same amount of PT-141 (MW 1025.2) would weigh 0.9981 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 20 mg vial of Tesamorelin equals how many mg of PT-141 in moles?
20 mg of Tesamorelin (MW 5136) is 3.894 µmol. The same amount of PT-141 (MW 1025.2) would weigh 3.992 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 Tesamorelin?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/pt-141-vs-tesamorelin/#sqa-040460
APA
Sable Peptides. (2026, October 11). *What is the difference between PT-141 and Tesamorelin?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/pt-141-vs-tesamorelin/#sqa-040460
BibTeX
@misc{sable_#sqa-040460_2026,
author = {{Sable Peptides}},
title = {{What is the difference between PT-141 and Tesamorelin?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/pt-141-vs-tesamorelin/#sqa-040460}},
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