What is Semax?
Semax is a synthetic peptide developed in Russia, derived from a fragment of the adrenocorticotropic hormone (ACTH 4–10) with a stabilising Pro-Gly-Pro tail added. Its sequence (Met-Glu-His-Phe-Pro-Gly-Pro) keeps the behavioural and neuro-activity of the ACTH fragment while removing its hormonal effects, and makes it stable enough to study as a research compound.
In the literature it's classified as a nootropic (cognition-related) and neuroprotective peptide, most often studied via the intranasal route.
How Semax Works
Semax is studied for several overlapping mechanisms rather than a single receptor target:
- BDNF & NGF expression — research consistently associates Semax with increased Brain-Derived Neurotrophic Factor and Nerve Growth Factor, the proteins central to neuroplasticity and neuron survival. This is its most-cited mechanism.
- Monoamine modulation — studied for effects on dopaminergic, serotonergic and cholinergic signalling, linked to its reported focus and drive effects.
- Neuroprotection — investigated for protecting neurons under stress such as reduced blood flow (ischemia).
- Enkephalin stabilisation — like Selank, the Pro-Gly-Pro tail is thought to slow enkephalin breakdown.
Unusually for a research peptide, Semax has a long history of clinical use in Russia, where it is listed for cognitive and circulatory brain conditions — which is why it attracts ongoing research interest internationally.
Key Research Areas
Cognition, Focus & Mental Fatigue
Semax's most popular research interest is in attention, focus, memory and mental performance — particularly under fatigue or high cognitive load. The BDNF/NGF and dopaminergic links are the mechanisms most often cited here.
Neuroprotection & Stroke
In Russia, Semax has been studied and used clinically in the setting of ischemic stroke and recovery, where the research interest is in protecting neurons and supporting recovery after reduced blood flow.
Optic Nerve & Neurological Research
Semax has also been investigated in optic nerve conditions and broader neurological research, again centred on its neuroprotective and growth-factor-related activity.
Semax vs Selank
Semax and Selank are the two best-known Russian-developed research peptides, both with a stabilising Pro-Gly-Pro tail and an intranasal route. The simplest distinction: Semax is studied more for focus, drive and neuroprotection, while Selank is studied more for anxiety and mood. Some research protocols investigate them as a pair.
Research Status
Where Semax stands matters. Much of the published research and its clinical use come from Russian institutions; independent Western replication is limited and study standards vary. While it is used clinically in Russia, Semax is not an approved medicine in South Africa or most markets — it remains an investigational compound for research use only.
LA LAB Semax
LA LAB supplies Semax as a lyophilized 11 mg vial, third-party tested by Janoshik Analytical for purity and identity. View it on our Semax product page, and see our reconstitution & research guides for how it's prepared and measured.