Dihexa vs Semax
Not a close call but a real evidence gap: Semax has small human studies behind it, Dihexa has none, plus a growth-pathway mechanism nobody has cleared in people.
Dihexa
Builds synapses potently in animals, but there are no human trials — and its c-Met growth-pathway mechanism raises unanswered safety questions.
Full Dihexa evidence reviewSemax
A BDNF-raising ACTH(4-10) analog registered as a drug in Russia — but the human evidence is small, single-country and mostly uncontrolled.
Full Semax evidence reviewSide by side
| Dihexa | Semax | |
|---|---|---|
| Marketed for | Cognition, memory | Cognition, focus, neuroprotection |
| Evidence grade | Preclinical / minimal | Clinical data |
| Family | Nootropic / cognitive | Nootropic / cognitive |
| Regulatory status | Not FDA-approved | Not FDA-approved |
| How it's obtained | Research-only | Research-only |
| Key human source | Benoist, J Pharmacol Exp Ther 2014 | Semax MND trial, Korsakov J 2007 |
marks a row where the two differ. Evidence grades come from our evidence matrix, which grades each molecule on the human data for the use it is marketed for.
Our verdict
These two are separated by a full rung on the evidence ladder. Semax has been given to people, though the trials are small, Russian, and mostly uncontrolled, and it is a registered drug in Russia while unapproved in the US. Dihexa has zero published human clinical trials for any indication: no efficacy data, no established dose, no human pharmacokinetics, and its synaptogenic effect appears to depend on the HGF/c-Met growth pathway, which leaves an unanswered theoretical safety question rather than a proven harm. Both are research-only in the US, and neither is FDA-approved.
Dihexa fits if
Dihexa is worth attention only as an early-stage research compound with a striking cell-culture and rodent story and an open safety question.
Semax fits if
Semax is the more defensible object of interest for anyone who wants at least some human data behind a nootropic peptide.
Where to get it
Where to get peptide therapy
Clinician-led telehealth services that prescribe compounded peptides. The specific peptides offered vary by provider — confirm Dihexa availability before ordering.
