Sable · Question
What is the difference between GHRP-6 and P21?
GHRP-6 is one of the earliest synthetic growth hormone secretagogue hexapeptides, used as a ghrelin receptor (GHS-R1a) agonist in endocrine research (peptide, MW about 873 g/mol).
Research use only. Not for human consumption. No health claims.
Last verified 2026-10-10
What is the difference between GHRP-6 and P21?
GHRP-6 is one of the earliest synthetic growth hormone secretagogue hexapeptides, used as a ghrelin receptor (GHS-R1a) agonist in endocrine research (peptide, MW about 873 g/mol).
Which is heavier, GHRP-6 or P21?
GHRP-6 has a molecular weight of about 873 g/mol and P21 about 578.7 g/mol (PubChem), so GHRP-6 is heavier by 294.3 g/mol, a ratio of 1.51. This means 1 mg of GHRP-6 contains 1,145.5 nmol versus 1,728 nmol for P21.
How many mg of P21 are equimolar to 1 mg of GHRP-6?
1 mg of GHRP-6 (MW 873) is 1,145.5 nmol. The same number of moles of P21 (MW 578.7) weighs 0.6629 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of GHRP-6 and P21
PubChem lists GHRP-6 as C46H56N12O6 (873 g/mol) and P21 as C27H42N6O8 (578.7 g/mol). GHRP-6 is a peptide; P21 is a peptidomimetic. These formulas refer to the parent compounds without salt counter-ions.
A 5 mg vial of GHRP-6 equals how many mg of P21 in moles?
5 mg of GHRP-6 (MW 873) is 5.727 µmol. The same amount of P21 (MW 578.7) would weigh 3.314 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of GHRP-6 equals how many mg of P21 in moles?
10 mg of GHRP-6 (MW 873) is 11.455 µmol. The same amount of P21 (MW 578.7) would weigh 6.629 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 GHRP-6 in moles?
10 mg of P21 (MW 578.7) is 17.28 µmol. The same amount of GHRP-6 (MW 873) would weigh 15.086 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 GHRP-6 in moles?
5 mg of P21 (MW 578.7) is 8.64 µmol. The same amount of GHRP-6 (MW 873) would weigh 7.543 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 GHRP-6 and P21?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/ghrp-6-vs-p21/#sqa-039244
APA
Sable Peptides. (2026, October 11). *What is the difference between GHRP-6 and P21?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/ghrp-6-vs-p21/#sqa-039244
BibTeX
@misc{sable_#sqa-039244_2026,
author = {{Sable Peptides}},
title = {{What is the difference between GHRP-6 and P21?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/ghrp-6-vs-p21/#sqa-039244}},
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