Sable · Question
What is the difference between Semax and TB-500?
Semax is a heptapeptide analogue of the ACTH(4-7) fragment extended with Pro-Gly-Pro, studied in neuropeptide and BDNF-expression research in rodent models (peptide, MW about 813.9 g/mol).
Research use only. Not for human consumption. No health claims.
Last verified 2026-10-10
What is the difference between Semax and TB-500?
Semax is a heptapeptide analogue of the ACTH(4-7) fragment extended with Pro-Gly-Pro, studied in neuropeptide and BDNF-expression research in rodent models (peptide, MW about 813.9 g/mol).
Which is heavier, Semax or TB-500?
Semax has a molecular weight of about 813.9 g/mol and TB-500 about 889 g/mol (PubChem), so TB-500 is heavier by 75.1 g/mol, a ratio of 1.09. This means 1 mg of Semax contains 1,228.7 nmol versus 1,124.9 nmol for TB-500.
How many mg of TB-500 are equimolar to 1 mg of Semax?
1 mg of Semax (MW 813.9) is 1,228.7 nmol. The same number of moles of TB-500 (MW 889) weighs 1.092 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of Semax and TB-500
PubChem lists Semax as C37H51N9O10S (813.9 g/mol) and TB-500 as C38H68N10O14 (889 g/mol). Semax is a peptide; TB-500 is a peptide. These formulas refer to the parent compounds without salt counter-ions.
A 5 mg vial of Semax equals how many mg of TB-500 in moles?
5 mg of Semax (MW 813.9) is 6.143 µmol. The same amount of TB-500 (MW 889) would weigh 5.461 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 TB-500 in moles?
10 mg of Semax (MW 813.9) is 12.287 µmol. The same amount of TB-500 (MW 889) would weigh 10.923 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 TB-500 in moles?
30 mg of Semax (MW 813.9) is 36.86 µmol. The same amount of TB-500 (MW 889) would weigh 32.768 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 Semax in moles?
10 mg of TB-500 (MW 889) is 11.249 µmol. The same amount of Semax (MW 813.9) would weigh 9.155 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 Semax in moles?
2 mg of TB-500 (MW 889) is 2.25 µmol. The same amount of Semax (MW 813.9) would weigh 1.831 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 Semax in moles?
5 mg of TB-500 (MW 889) is 5.624 µmol. The same amount of Semax (MW 813.9) would weigh 4.578 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 Semax in moles?
15 mg of TB-500 (MW 889) is 16.873 µmol. The same amount of Semax (MW 813.9) would weigh 13.733 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 Semax in moles?
20 mg of TB-500 (MW 889) is 22.497 µmol. The same amount of Semax (MW 813.9) would weigh 18.31 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 Semax and TB-500?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/semax-vs-tb-500/#sqa-040863
APA
Sable Peptides. (2026, October 11). *What is the difference between Semax and TB-500?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/semax-vs-tb-500/#sqa-040863
BibTeX
@misc{sable_#sqa-040863_2026,
author = {{Sable Peptides}},
title = {{What is the difference between Semax and TB-500?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/semax-vs-tb-500/#sqa-040863}},
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