Sable · Question
What is the difference between Hexarelin and P21?
Hexarelin is a synthetic hexapeptide growth hormone secretagogue, also studied for binding to the CD36 receptor in cardiovascular research models (peptide, MW about 887 g/mol).
Research use only. Not for human consumption. No health claims.
Last verified 2026-10-10
What is the difference between Hexarelin and P21?
Hexarelin is a synthetic hexapeptide growth hormone secretagogue, also studied for binding to the CD36 receptor in cardiovascular research models (peptide, MW about 887 g/mol).
Which is heavier, Hexarelin or P21?
Hexarelin has a molecular weight of about 887 g/mol and P21 about 578.7 g/mol (PubChem), so Hexarelin is heavier by 308.3 g/mol, a ratio of 1.53. This means 1 mg of Hexarelin contains 1,127.4 nmol versus 1,728 nmol for P21.
How many mg of P21 are equimolar to 1 mg of Hexarelin?
1 mg of Hexarelin (MW 887) is 1,127.4 nmol. The same number of moles of P21 (MW 578.7) weighs 0.6524 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of Hexarelin and P21
PubChem lists Hexarelin as C47H58N12O6 (887 g/mol) and P21 as C27H42N6O8 (578.7 g/mol). Hexarelin is a peptide; P21 is a peptidomimetic. These formulas refer to the parent compounds without salt counter-ions.
A 2 mg vial of Hexarelin equals how many mg of P21 in moles?
2 mg of Hexarelin (MW 887) is 2.255 µmol. The same amount of P21 (MW 578.7) would weigh 1.305 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of Hexarelin equals how many mg of P21 in moles?
5 mg of Hexarelin (MW 887) is 5.637 µmol. The same amount of P21 (MW 578.7) would weigh 3.262 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of Hexarelin equals how many mg of P21 in moles?
10 mg of Hexarelin (MW 887) is 11.274 µmol. The same amount of P21 (MW 578.7) would weigh 6.524 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 Hexarelin in moles?
10 mg of P21 (MW 578.7) is 17.28 µmol. The same amount of Hexarelin (MW 887) would weigh 15.327 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 Hexarelin in moles?
5 mg of P21 (MW 578.7) is 8.64 µmol. The same amount of Hexarelin (MW 887) would weigh 7.664 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
More questions about hexarelin
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 Hexarelin and P21?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/hexarelin-vs-p21/#sqa-039494
APA
Sable Peptides. (2026, October 11). *What is the difference between Hexarelin and P21?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/hexarelin-vs-p21/#sqa-039494
BibTeX
@misc{sable_#sqa-039494_2026,
author = {{Sable Peptides}},
title = {{What is the difference between Hexarelin and P21?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/hexarelin-vs-p21/#sqa-039494}},
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