Semax
The Russian Nootropic Peptide for Focus & BDNF
Semax is a synthetic heptapeptide analogue of ACTH(4-7) developed in Russia in the 1980s. It is approved in Russia for stroke, TBI, and optic nerve disease, and is widely used as a cognitive enhancer for focus, memory, and neuroprotection.
What Is Semax?
Semax (sequence: Met-Glu-His-Phe-Pro-Gly-Pro) was developed by the Institute of Molecular Genetics in Moscow in the 1980s as a stable, bioavailable fragment of adrenocorticotropic hormone (ACTH). Unlike ACTH itself, Semax has no hormonal (steroidogenic) activity — it acts purely through neuropeptide receptor pathways in the brain.
It holds official drug approval in Russia for ischemic stroke recovery, traumatic brain injury, optic nerve disease, and cognitive decline. Outside Russia it is an unscheduled research compound used by the nootropic community for cognitive enhancement.
Key administration fact: Semax must be administered intranasally to cross the blood-brain barrier effectively. Oral dosing is destroyed by digestive enzymes; subcutaneous injection reaches the periphery but has very poor CNS bioavailability compared to nasal delivery.
How Semax Works
BDNF & NGF Upregulation
- • Increases BDNF (brain-derived neurotrophic factor) in hippocampus
- • Elevates NGF (nerve growth factor) expression
- • Promotes neuroplasticity and long-term potentiation
- • Supports synaptic density and cognitive resilience
Neurotransmitter Modulation
- • Modulates dopaminergic system (motivation, drive)
- • Modulates serotonergic system (mood stabilization)
- • Reduces oxidative stress in neurons
- • Neuroprotective against ischemic damage
Reported Cognitive Effects
- • Enhanced focus and working memory
- • Improved motivation and mental drive
- • Mild antidepressant effect (low-energy depression)
- • Mental clarity — especially during high-demand work
Neuroprotection
- • Approved for stroke recovery acceleration in Russia
- • Used clinically post-TBI for neurological recovery
- • Protective against optic nerve degeneration
- • Studied for Alzheimer's-related cognitive protection
Semax Variants
| Variant | Modification | Notes |
|---|---|---|
| Semax | Base heptapeptide | Standard; shortest half-life; Russian approved drug form |
| NA-Semax | N-Acetyl terminus | Extended half-life; improved stability; popular research variant |
| NA-Semax Amidate | N-Acetyl + C-Amide | Most potent and longest-acting; lower dose required (100-300mcg/day) |
Semax Dosing Protocol
Semax is administered intranasally only for meaningful CNS effects. Typical concentration is 0.1% solution (1mg/mL), delivered by a nasal spray bottle where each spray deposits approximately 50-100mcg per nostril.
Typical Cycle Protocol
- • On-cycle: 2-4 weeks of daily intranasal dosing
- • Off-cycle: 1-2 weeks break to assess baseline and avoid tolerance
- • Timing: Morning dosing preferred (stimulating effect); avoid late evening to prevent sleep disruption
- • NA-Semax Amidate: Reduce doses by 50-70% relative to base Semax doses above
Side Effects & Safety
Generally Well Tolerated
- • No known dependence or withdrawal effects
- • No steroidal or hormonal activity
- • Approved drug with long clinical history in Russia
- • No organ toxicity reported at standard doses
Reported Minor Side Effects
- • Fatigue at excessively high doses
- • Mild irritability or anxiety in some individuals
- • Transient nasal irritation or mild nasal dryness
- • Sleep disturbance if dosed late in the day
Stacking Semax with Selank
The most popular Semax stack is combining it with Selank, creating the "Russian peptide stack." The two peptides are complementary: Semax provides stimulation, focus, and dopaminergic drive, while Selank provides GABAergic calming and anxiety relief — preventing the edge or anxiety that some users experience on Semax alone.
Semax (AM)
300-600mcg intranasally in the morning for cognitive activation and focus during work sessions.
Selank (PM or as needed)
250-500mcg intranasally in the afternoon/evening or when anxiety arises to balance stimulating effects.
Frequently Asked Questions
How does Semax work in the brain?
Semax is a synthetic analogue of ACTH(4-7) that increases BDNF and NGF in the hippocampus, modulates dopamine and serotonin systems, and provides neuroprotection via oxidative stress reduction. These combined actions enhance focus, working memory, and mood.
What is the correct Semax dosage and route of administration?
The standard dose is 300-600mcg per day administered intranasally (2-3 sprays per nostril, twice daily). Intranasal is the only practical route for CNS effects — oral dosing is destroyed by digestion and subcutaneous injection has very poor blood-brain barrier crossing.
What is the difference between Semax, NA-Semax, and NA-Semax Amidate?
Semax is the base heptapeptide. NA-Semax (N-Acetyl Semax) has an acetylated N-terminus extending half-life and stability. NA-Semax Amidate adds an amidated C-terminus for the most potent and longest-acting variant, typically used at lower doses (100-300mcg/day) for equivalent effect.
Track Your Semax Protocol
Log daily doses, cognitive focus scores, mood, and cycle days. Shotlee makes it easy to see how Semax is working for you over time.
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