Sable · Question
What is the difference between Melanotan I and SS-31?
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 SS-31?
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 SS-31?
Melanotan I has a molecular weight of about 1646.8 g/mol and SS-31 about 639.8 g/mol (PubChem), so Melanotan I is heavier by 1,007 g/mol, a ratio of 2.57. This means 1 mg of Melanotan I contains 607.2 nmol versus 1,563 nmol for SS-31.
How many mg of SS-31 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 SS-31 (MW 639.8) weighs 0.3885 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of Melanotan I and SS-31
PubChem lists Melanotan I as C78H111N21O19 (1646.8 g/mol) and SS-31 as C32H49N9O5 (639.8 g/mol). Melanotan I is a peptide; SS-31 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 SS-31 in moles?
5 mg of Melanotan I (MW 1646.8) is 3.036 µmol. The same amount of SS-31 (MW 639.8) would weigh 1.943 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 SS-31 in moles?
10 mg of Melanotan I (MW 1646.8) is 6.072 µmol. The same amount of SS-31 (MW 639.8) would weigh 3.885 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of SS-31 equals how many mg of Melanotan I in moles?
5 mg of SS-31 (MW 639.8) is 7.815 µmol. The same amount of Melanotan I (MW 1646.8) would weigh 12.87 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of SS-31 equals how many mg of Melanotan I in moles?
10 mg of SS-31 (MW 639.8) is 15.63 µmol. The same amount of Melanotan I (MW 1646.8) would weigh 25.739 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 SS-31?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/melanotan-i-vs-ss-31/#sqa-040084
APA
Sable Peptides. (2026, October 11). *What is the difference between Melanotan I and SS-31?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/melanotan-i-vs-ss-31/#sqa-040084
BibTeX
@misc{sable_#sqa-040084_2026,
author = {{Sable Peptides}},
title = {{What is the difference between Melanotan I and SS-31?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/melanotan-i-vs-ss-31/#sqa-040084}},
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