OnePin Peptide Library · Cognitive & Mood
Semax
Semax Acetate
Semax is a synthetic heptapeptide derived from ACTH(4-10), the biologically active fragment of adrenocorticotropic hormone, with a stabilizing Pro-Gly-Pro C-terminal extension that protects against enzymatic degradation. Developed at the Institute of Molecular Genetics of the Russian Academy of Sciences, Semax has been approved in Russia and Ukraine as a prescription medication for cognitive enhancement, neuroprotection, and stroke recovery. It exerts nootropic effects primarily through upregulation of brain-derived neurotrophic factor (BDNF) and tropomyosin receptor kinase B (TrkB) signaling, without the adrenal-stimulating effects of full-length ACTH. Semax is stimulating and is best administered in the morning to avoid sleep disruption.
Intranasal: Any time of day. Cognitive effects peak 15-30 minutes after dosing. SubQ: Same timing. No fasting required. Multiple daily doses for sustained effect.
Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.
How it works
Semax activates melanocortin receptors (MC3R, MC4R) in the brain, triggering downstream signaling that upregulates BDNF expression and TrkB receptor activation in the hippocampus and cortex. BDNF is the primary neurotrophin supporting neuronal survival, differentiation, and synaptic plasticity (the cellular basis of learning and memory). Semax also modulates serotonergic and dopaminergic neurotransmission, increases expression of nerve growth factor (NGF) and glial cell line-derived neurotrophic factor (GDNF), and enhances cerebral blood flow. The Pro-Gly-Pro C-terminal modification protects against DPP-IV and aminopeptidase degradation, extending the effective half-life. Critically, Semax does NOT stimulate the adrenal cortex at standard doses (unlike full-length ACTH), meaning no cortisol elevation.
Semax activates melanocortin receptors (MC3R, MC4R) in the brain, triggering downstream signaling that upregulates BDNF expression and TrkB receptor activation in the hippocampus and cortex. BDNF is the primary neurotrophin supporting neuronal survival, differentiation, and synaptic plasticity (the cellular basis of learning and memory). Semax also modulates serotonergic and dopaminergic neurotransmission, increases expression of nerve growth factor (NGF) and glial cell line-derived neurotrophic factor (GDNF), and enhances cerebral blood flow. The Pro-Gly-Pro C-terminal modification protects against DPP-IV and aminopeptidase degradation, extending the effective half-life. Critically, Semax does NOT stimulate the adrenal cortex at standard doses (unlike full-length ACTH), meaning no cortisol elevation.
What to expect
Days 1-3: Many users report noticeable cognitive effects within the first few days. Improved focus, verbal fluency, and mental energy. Stimulating nature becomes apparent. If sleep is disrupted, dose is too late in the day.
Weeks 1-4: Consistent cognitive enhancement. BDNF upregulation effects compound over time. Memory and learning capacity improve. Mood stabilization. Best effects typically reported at 2-4 weeks.
Weeks 4-8: Sustained neuroplasticity benefits. Some users report the effects plateau, which is one reason for cycling. The 4-8 week cycle allows receptor sensitivity to reset.
Evidence
The honest take
Cognitive enhancement
Strongest claim. Approved in Russia for this purpose. Published human data supports improved attention, memory, and processing in both healthy and impaired populations.
Russian clinical studies show improved outcomes in acute ischemic stroke when Semax is administered alongside standard care. Mechanism (BDNF, cerebral blood flow) is well-supported.
Confirmed in multiple animal and human studies. BDNF increase is dose-dependent and well-characterized. This is the primary mechanism of cognitive benefits.
Interactions & stacking
What's safe to combine, and what belongs in a separate pin.
Safe & synergistic
Keep separate
Side effects & safety
Commonly reported
- Overstimulation if dosed too high or too late in the day
- Sleep disruption if administered in the afternoon or evening
- Mild headache (usually resolves within first few days)
- Slight appetite changes
Less common & notes
- Anxiety or irritability at higher doses (reduce dose).
- Hair loss has been reported anecdotally with prolonged use (mechanism unclear, possibly related to melanocortin receptor effects).
- Nasal irritation if using intranasal route.
- Semax does NOT elevate cortisol at standard doses despite being derived from ACTH.
- Long-term safety data from Russian clinical use is available but may not meet Western standards.
Pharmacokinetics
Storage. Store unreconstituted vials frozen (-20C) or refrigerated (2-8C). After reconstitution with BAC water, refrigerate at 2-8C. Stable for 28 days. Pro-Gly-Pro C-terminal modification enhances stability against enzymatic degradation. Protect from light.
Regulatory status
Approved as a prescription medication in Russia and Ukraine for cognitive disorders, stroke recovery, and neuroprotection. Not FDA-approved in the United States. Available as a research peptide. WADA status: Not specifically listed but may fall under S0 Non-Approved Substances for competitive athletes.
Put it to work
Calculate, log & track
Open Semax straight into OnePin with your vial and dose pre-filled, then let it handle the syringe math and remind you before the vial runs out.
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The guide & community
The complete Semax walkthrough, real protocol discussion and coaching live inside the BlessUp community on Skool.
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