Sable · Question
What is the difference between Melanotan I and Semax?
Melanotan I is a linear 13-residue alpha-MSH analogue used in melanocortin-1 receptor research (peptide, MW about 1646.8 g/mol).
Research use only. Not for human consumption. No health claims.
Last verified 2026-10-10
What is the difference between Melanotan I and Semax?
Melanotan I is a linear 13-residue alpha-MSH analogue used in melanocortin-1 receptor research (peptide, MW about 1646.8 g/mol).
Which is heavier, Melanotan I or Semax?
Melanotan I has a molecular weight of about 1646.8 g/mol and Semax about 813.9 g/mol (PubChem), so Melanotan I is heavier by 832.9 g/mol, a ratio of 2.02. This means 1 mg of Melanotan I contains 607.2 nmol versus 1,228.7 nmol for Semax.
How many mg of Semax are equimolar to 1 mg of Melanotan I?
1 mg of Melanotan I (MW 1646.8) is 607.2 nmol. The same number of moles of Semax (MW 813.9) weighs 0.4942 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of Melanotan I and Semax
PubChem lists Melanotan I as C78H111N21O19 (1646.8 g/mol) and Semax as C37H51N9O10S (813.9 g/mol). Melanotan I is a peptide; Semax is a peptide. These formulas refer to the parent compounds without salt counter-ions.
A 5 mg vial of Melanotan I equals how many mg of Semax in moles?
5 mg of Melanotan I (MW 1646.8) is 3.036 µmol. The same amount of Semax (MW 813.9) would weigh 2.471 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of Melanotan I equals how many mg of Semax in moles?
10 mg of Melanotan I (MW 1646.8) is 6.072 µmol. The same amount of Semax (MW 813.9) would weigh 4.942 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of Semax equals how many mg of Melanotan I in moles?
5 mg of Semax (MW 813.9) is 6.143 µmol. The same amount of Melanotan I (MW 1646.8) would weigh 10.117 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of Semax equals how many mg of Melanotan I in moles?
10 mg of Semax (MW 813.9) is 12.287 µmol. The same amount of Melanotan I (MW 1646.8) would weigh 20.233 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 30 mg vial of Semax equals how many mg of Melanotan I in moles?
30 mg of Semax (MW 813.9) is 36.86 µmol. The same amount of Melanotan I (MW 1646.8) would weigh 60.7 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
More questions about melanotan-i
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 Melanotan I and Semax?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/melanotan-i-vs-semax/#sqa-040096
APA
Sable Peptides. (2026, October 11). *What is the difference between Melanotan I and Semax?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/melanotan-i-vs-semax/#sqa-040096
BibTeX
@misc{sable_#sqa-040096_2026,
author = {{Sable Peptides}},
title = {{What is the difference between Melanotan I and Semax?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/melanotan-i-vs-semax/#sqa-040096}},
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