Semax vs Selank
Both are Russian-developed heptapeptides that share a stabilising Pro-Gly-Pro tail, but their parent sequences differ. Semax comes from ACTH(4-10) and is studied for neurotrophic signalling; Selank comes from tuftsin and is studied for stress-response and GABAergic pathways.
Heptapeptide analogue of ACTH(4-10)
Choose Semax if
- ✓ Your work centres on BDNF or neurotrophic endpoints
- ✓ You are studying ACTH-fragment pharmacology
Heptapeptide analogue of tuftsin
Choose Selank if
- ✓ Your work centres on stress-response or GABAergic models
- ✓ You are studying tuftsin analogues
Side-by-side specification
| Compare | Semax Heptapeptide analogue of ACTH(4-10) | Selank Heptapeptide analogue of tuftsin |
|---|---|---|
| Class | ACTH(4-10) analogue | Tuftsin analogue |
| Research area | Neuro & longevity | Neuro & longevity |
| Receptor targets | Neurotrophic and melanocortin-related pathways (mechanism debated) | GABAergic and cytokine-related pathways (mechanism debated) |
| Length | 7 amino acids | 7 amino acids |
| Molecular mass | ≈ 814 Da | ≈ 752 Da |
| Origin | Synthetic analogue of an ACTH fragment | Synthetic analogue of an immune-derived peptide |
| Evidence level | 2/5 Mostly animal and in vitro | 2/5 Mostly animal and in vitro |
| Regulatory status | Registered in Russia | Registered in Russia |
| Nordapep from | Not listed | £44.91 |
| Best price per mg | Not listed | £4.49/mg |
| View Semax at Nordapep → | View Selank at Nordapep → |
What separates them
Both are registered medicines in Russia only, and both have limited independent replication elsewhere.
Read the full guides for Semax and Selank, or add a third compound in the comparison tool.
FAQ
Why do they end in the same three amino acids?
Both carry a Pro-Gly-Pro tail added to protect the short peptide from breakdown by peptidases.
Are Semax and Selank approved medicines?
Semax: Registered in Russia. Selank: Registered in Russia. Research-grade material of either is not a medicine and is supplied for in vitro research only.
Where can I buy Semax and Selank?
Nordapep lists compounds with a Certificate of Analysis matched to the batch reference. Check each compound page for current availability.
More comparisons
Where to buy
Why we send researchers to Nordapep
Comparing compounds is only half the job. The other half is knowing the vial contains what the label says. Nordapep publishes batch documentation for every compound it sells.
Browse the Nordapep catalogue →Each batch reference on the label matches its CoA, so you can check what is in the vial.
Enter the batch reference from your vial into Nordapep's batch-verification tool.
Purity is reported by RP-HPLC, the standard method for peptides of this size.
Bundled stacks for common comparisons, plus tiered pricing for volume orders.