Sable · Question
What is the difference between GHK-Cu and P21?
GHK-Cu is a copper(II) complex of the tripeptide GHK, first identified in human plasma, and widely studied in skin-biology, cosmetic-science and wound-model research (peptide-copper complex, MW about 402.92 g/mol).
Research use only. Not for human consumption. No health claims.
Last verified 2026-10-10
What is the difference between GHK-Cu and P21?
GHK-Cu is a copper(II) complex of the tripeptide GHK, first identified in human plasma, and widely studied in skin-biology, cosmetic-science and wound-model research (peptide-copper complex, MW about 402.92 g/mol).
Which is heavier, GHK-Cu or P21?
GHK-Cu has a molecular weight of about 402.92 g/mol and P21 about 578.7 g/mol (PubChem), so P21 is heavier by 175.8 g/mol, a ratio of 1.44. This means 1 mg of GHK-Cu contains 2,481.9 nmol versus 1,728 nmol for P21.
How many mg of P21 are equimolar to 1 mg of GHK-Cu?
1 mg of GHK-Cu (MW 402.92) is 2,481.9 nmol. The same number of moles of P21 (MW 578.7) weighs 1.436 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of GHK-Cu and P21
PubChem lists GHK-Cu as C14H23CuN6O4+ (402.92 g/mol) and P21 as C27H42N6O8 (578.7 g/mol). GHK-Cu is a peptide-copper complex; P21 is a peptidomimetic. These formulas refer to the parent compounds without salt counter-ions.
A 5 mg vial of GHK-Cu equals how many mg of P21 in moles?
5 mg of GHK-Cu (MW 402.92) is 12.409 µmol. The same amount of P21 (MW 578.7) would weigh 7.181 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 50 mg vial of GHK-Cu equals how many mg of P21 in moles?
50 mg of GHK-Cu (MW 402.92) is 124.1 µmol. The same amount of P21 (MW 578.7) would weigh 71.813 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of GHK-Cu equals how many mg of P21 in moles?
10 mg of GHK-Cu (MW 402.92) is 24.819 µmol. The same amount of P21 (MW 578.7) would weigh 14.363 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 20 mg vial of GHK-Cu equals how many mg of P21 in moles?
20 mg of GHK-Cu (MW 402.92) is 49.638 µmol. The same amount of P21 (MW 578.7) would weigh 28.725 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 30 mg vial of GHK-Cu equals how many mg of P21 in moles?
30 mg of GHK-Cu (MW 402.92) is 74.456 µmol. The same amount of P21 (MW 578.7) would weigh 43.088 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 100 mg vial of GHK-Cu equals how many mg of P21 in moles?
100 mg of GHK-Cu (MW 402.92) is 248.2 µmol. The same amount of P21 (MW 578.7) would weigh 143.6 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 GHK-Cu in moles?
10 mg of P21 (MW 578.7) is 17.28 µmol. The same amount of GHK-Cu (MW 402.92) would weigh 6.963 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 GHK-Cu in moles?
5 mg of P21 (MW 578.7) is 8.64 µmol. The same amount of GHK-Cu (MW 402.92) would weigh 3.481 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 GHK-Cu and P21?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/ghk-cu-vs-p21/#sqa-038978
APA
Sable Peptides. (2026, October 11). *What is the difference between GHK-Cu and P21?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/ghk-cu-vs-p21/#sqa-038978
BibTeX
@misc{sable_#sqa-038978_2026,
author = {{Sable Peptides}},
title = {{What is the difference between GHK-Cu and P21?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/ghk-cu-vs-p21/#sqa-038978}},
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