Sable · Question
What is the difference between Semaglutide and P21?
Semaglutide is a GLP-1 receptor agonist peptide with an Aib substitution at position 8 and a C18 fatty diacid on Lys26 for albumin binding, studied in incretin receptor pharmacology (peptide (lipidated), MW about 4114 g/mol).
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Last verified 2026-10-10
What is the difference between Semaglutide and P21?
Semaglutide is a GLP-1 receptor agonist peptide with an Aib substitution at position 8 and a C18 fatty diacid on Lys26 for albumin binding, studied in incretin receptor pharmacology (peptide (lipidated), MW about 4114 g/mol).
Which is heavier, Semaglutide or P21?
Semaglutide has a molecular weight of about 4114 g/mol and P21 about 578.7 g/mol (PubChem), so Semaglutide is heavier by 3,535.3 g/mol, a ratio of 7.11. This means 1 mg of Semaglutide contains 243.1 nmol versus 1,728 nmol for P21.
How many mg of P21 are equimolar to 1 mg of Semaglutide?
1 mg of Semaglutide (MW 4114) is 243.1 nmol. The same number of moles of P21 (MW 578.7) weighs 0.1407 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of Semaglutide and P21
PubChem lists Semaglutide as C187H291N45O59 (4114 g/mol) and P21 as C27H42N6O8 (578.7 g/mol). Semaglutide is a peptide (lipidated); P21 is a peptidomimetic. These formulas refer to the parent compounds without salt counter-ions.
A 10 mg vial of P21 equals how many mg of Semaglutide in moles?
10 mg of P21 (MW 578.7) is 17.28 µmol. The same amount of Semaglutide (MW 4114) would weigh 71.09 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of P21 equals how many mg of Semaglutide in moles?
5 mg of P21 (MW 578.7) is 8.64 µmol. The same amount of Semaglutide (MW 4114) would weigh 35.545 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 1 mg vial of Semaglutide equals how many mg of P21 in moles?
1 mg of Semaglutide (MW 4114) is 0.2431 µmol. The same amount of P21 (MW 578.7) would weigh 0.1407 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 2 mg vial of Semaglutide equals how many mg of P21 in moles?
2 mg of Semaglutide (MW 4114) is 0.4861 µmol. The same amount of P21 (MW 578.7) would weigh 0.2813 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 8 mg vial of Semaglutide equals how many mg of P21 in moles?
8 mg of Semaglutide (MW 4114) is 1.945 µmol. The same amount of P21 (MW 578.7) would weigh 1.125 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of Semaglutide equals how many mg of P21 in moles?
5 mg of Semaglutide (MW 4114) is 1.215 µmol. The same amount of P21 (MW 578.7) would weigh 0.7033 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of Semaglutide equals how many mg of P21 in moles?
10 mg of Semaglutide (MW 4114) is 2.431 µmol. The same amount of P21 (MW 578.7) would weigh 1.407 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 20 mg vial of Semaglutide equals how many mg of P21 in moles?
20 mg of Semaglutide (MW 4114) is 4.861 µmol. The same amount of P21 (MW 578.7) would weigh 2.813 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 30 mg vial of Semaglutide equals how many mg of P21 in moles?
30 mg of Semaglutide (MW 4114) is 7.292 µmol. The same amount of P21 (MW 578.7) would weigh 4.22 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
More questions about semaglutide
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 Semaglutide and P21?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/p21-vs-semaglutide/#sqa-040796
APA
Sable Peptides. (2026, October 11). *What is the difference between Semaglutide and P21?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/p21-vs-semaglutide/#sqa-040796
BibTeX
@misc{sable_#sqa-040796_2026,
author = {{Sable Peptides}},
title = {{What is the difference between Semaglutide and P21?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/p21-vs-semaglutide/#sqa-040796}},
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