Sable · Question
What is the difference between Ipamorelin and P21?
Ipamorelin is a pentapeptide ghrelin receptor agonist reported in 1998 as a selective growth hormone secretagogue in endocrine research (peptide, MW about 711.9 g/mol).
Research use only. Not for human consumption. No health claims.
Last verified 2026-10-10
What is the difference between Ipamorelin and P21?
Ipamorelin is a pentapeptide ghrelin receptor agonist reported in 1998 as a selective growth hormone secretagogue in endocrine research (peptide, MW about 711.9 g/mol).
Which is heavier, Ipamorelin or P21?
Ipamorelin has a molecular weight of about 711.9 g/mol and P21 about 578.7 g/mol (PubChem), so Ipamorelin is heavier by 133.2 g/mol, a ratio of 1.23. This means 1 mg of Ipamorelin contains 1,404.7 nmol versus 1,728 nmol for P21.
How many mg of P21 are equimolar to 1 mg of Ipamorelin?
1 mg of Ipamorelin (MW 711.9) is 1,404.7 nmol. The same number of moles of P21 (MW 578.7) weighs 0.8129 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of Ipamorelin and P21
PubChem lists Ipamorelin as C38H49N9O5 (711.9 g/mol) and P21 as C27H42N6O8 (578.7 g/mol). Ipamorelin is a peptide; P21 is a peptidomimetic. These formulas refer to the parent compounds without salt counter-ions.
A 2 mg vial of Ipamorelin equals how many mg of P21 in moles?
2 mg of Ipamorelin (MW 711.9) is 2.809 µmol. The same amount of P21 (MW 578.7) would weigh 1.626 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of Ipamorelin equals how many mg of P21 in moles?
10 mg of Ipamorelin (MW 711.9) is 14.047 µmol. The same amount of P21 (MW 578.7) would weigh 8.129 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of Ipamorelin equals how many mg of P21 in moles?
5 mg of Ipamorelin (MW 711.9) is 7.023 µmol. The same amount of P21 (MW 578.7) would weigh 4.064 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of P21 equals how many mg of Ipamorelin in moles?
10 mg of P21 (MW 578.7) is 17.28 µmol. The same amount of Ipamorelin (MW 711.9) would weigh 12.302 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 Ipamorelin in moles?
5 mg of P21 (MW 578.7) is 8.64 µmol. The same amount of Ipamorelin (MW 711.9) would weigh 6.151 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
More questions about ipamorelin
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 Ipamorelin and P21?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/ipamorelin-vs-p21/#sqa-039613
APA
Sable Peptides. (2026, October 11). *What is the difference between Ipamorelin and P21?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/ipamorelin-vs-p21/#sqa-039613
BibTeX
@misc{sable_#sqa-039613_2026,
author = {{Sable Peptides}},
title = {{What is the difference between Ipamorelin and P21?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/ipamorelin-vs-p21/#sqa-039613}},
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