Research use only · Lyophilised material · Not a medicine · Not for human or veterinary use · Disclaimer
Sable Peptides

Sable · Question

What is the difference between Melanotan I and TB-500?

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 TB-500?

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 TB-500?

Melanotan I has a molecular weight of about 1646.8 g/mol and TB-500 about 889 g/mol (PubChem), so Melanotan I is heavier by 757.8 g/mol, a ratio of 1.85. This means 1 mg of Melanotan I contains 607.2 nmol versus 1,124.9 nmol for TB-500.

How many mg of TB-500 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 TB-500 (MW 889) weighs 0.5398 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.

Compare the molecular formulas of Melanotan I and TB-500

PubChem lists Melanotan I as C78H111N21O19 (1646.8 g/mol) and TB-500 as C38H68N10O14 (889 g/mol). Melanotan I is a peptide; TB-500 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 TB-500 in moles?

5 mg of Melanotan I (MW 1646.8) is 3.036 µmol. The same amount of TB-500 (MW 889) would weigh 2.699 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 TB-500 in moles?

10 mg of Melanotan I (MW 1646.8) is 6.072 µmol. The same amount of TB-500 (MW 889) would weigh 5.398 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.

A 10 mg vial of TB-500 equals how many mg of Melanotan I in moles?

10 mg of TB-500 (MW 889) is 11.249 µmol. The same amount of Melanotan I (MW 1646.8) would weigh 18.524 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.

A 2 mg vial of TB-500 equals how many mg of Melanotan I in moles?

2 mg of TB-500 (MW 889) is 2.25 µmol. The same amount of Melanotan I (MW 1646.8) would weigh 3.705 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.

A 5 mg vial of TB-500 equals how many mg of Melanotan I in moles?

5 mg of TB-500 (MW 889) is 5.624 µmol. The same amount of Melanotan I (MW 1646.8) would weigh 9.262 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.

A 15 mg vial of TB-500 equals how many mg of Melanotan I in moles?

15 mg of TB-500 (MW 889) is 16.873 µmol. The same amount of Melanotan I (MW 1646.8) would weigh 27.786 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.

A 20 mg vial of TB-500 equals how many mg of Melanotan I in moles?

20 mg of TB-500 (MW 889) is 22.497 µmol. The same amount of Melanotan I (MW 1646.8) would weigh 37.048 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 TB-500?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/melanotan-i-vs-tb-500/#sqa-040152

APA

Sable Peptides. (2026, October 11). *What is the difference between Melanotan I and TB-500?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/melanotan-i-vs-tb-500/#sqa-040152

BibTeX

@misc{sable_#sqa-040152_2026,
  author = {{Sable Peptides}},
  title = {{What is the difference between Melanotan I and TB-500?}},
  year = {2026},
  howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/melanotan-i-vs-tb-500/#sqa-040152}},
  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