Semax
Brain-boosting peptide that increases BDNF by ~1.4x at the protein level and up to 3x at mRNA level in animal studies. Promotes neurogenesis, improves cerebral blood flow. Used clinically in Russia for stroke recovery and cognitive decline.
Key Facts
- ClassificationSemax is a synthetic ACTH(4-10) analog without corticotropic activity.
- Primary BenefitsBrain & Cognition (9/10) · Mood & Anxiety (5/10) · Injury Healing (3/10)
- AdministrationIntranasal, Injection
- Typical Dose300-600 mcg subq or nasal spray, 3 times a week on an empty stomach. Take it before noon. Cycle: 8-12 weeks on, 2 weeks off. Can be mixed in the same syringe with SS-31, NAD+, or Selank.
- Evidence StrengthModerate — 20 peer-reviewed studies referenced · Community sentiment 8/10
- Stacks Well WithSelank, Dihexa, SS-31, NAD+
- Legal StatusResearch Use Only · not prescribable in US
Quick Facts
- From price
- $28
- Type
- peptide
- Administration
- Intranasal, Injection
- Evidence
- moderate
- Studies referenced
- 20
- Community sentiment
- 8/10
- Stacks with
- 6 peptides
- Regulatory
- Research Use Only
Top benefits
Week 1–2
Improved focus, mental clarity, and verbal fluency within hours. Enhanced motivation and productivity. Mild mood elevation. Subtle increase in energy.
Week 3–6
Sustained cognitive enhancement. Better memory consolidation and recall. Improved creative thinking. BDNF-mediated neuroplasticity building over time.
Week 8+
Peak nootropic benefits. Long-term neuroprotective effects accumulating. Benefits may taper slightly — cycling helps maintain efficacy.
Common Side Effects
Scientific Overview
Semax is a synthetic ACTH(4-10) analog without corticotropic activity. Demonstrates nootropic and neuroprotective properties through BDNF/trkB signaling, hippocampal neurogenesis, and NGF/NT-3 upregulation. Increases cerebral blood flow. Approved in Russia for stroke, cognitive disorders, and optic nerve atrophy.
Dosing
300-600 mcg subq or nasal spray, 3 times a week on an empty stomach. Take it before noon. Cycle: 8-12 weeks on, 2 weeks off. Can be mixed in the same syringe with SS-31, NAD+, or Selank.
Reconstitution, storage, injection sites & timing
Benefit Profile
| Vendor | Variant | Price | |
|---|---|---|---|
| Limitless Biotech | Nasal 5mg | $42.99 | Code: PSTACK10Buy |
| Skye Peptides | 5mg | $29.99 | |
| Skye Peptides | Nasal 5mg | $39.99 | |
| Amino Asylum ⚠ Reported federal raid in 2025 | 5mg | $27.99BEST | |
| Peptide Sciences ✕ Announced voluntary shutdown — stock availability may be limited or unavailable. Pricing data may be outdated. | 5mg | $38.00 | Out of stock |
Stacks Well With
Selank
Russian anxiolytic peptide working on GABA, serotonin, and enkephalin systems. Eases anxiety without sedation or dependence risk. Also boosts immunity. Decades of clinical use.
Dihexa
Brain peptide originally claimed to be 10 million times more potent than BDNF for forming connections. However, the foundational paper was retracted in April 2025 after confirmed data fabrication. A clinical trial also failed all endpoints. Evidence base is now significantly weakened.
SS-31 (Elamipretide)
Engineered to target inner mitochondrial membrane via cardiolipin binding. Stabilizes cristae, improves ATP production, and reduces oxidative stress. FDA-approved for Barth syndrome (as Forzinity) — the first FDA-approved mitochondria-targeted therapy.
NAD+ (Nicotinamide Adenine Dinucleotide)
Critical molecule for cellular energy and DNA repair. Levels may drop ~50% by middle age. Activates sirtuin longevity genes and powers PARP DNA repair enzymes. Injectable form bypasses oral absorption issues.
Pinealon
Three-amino-acid Khavinson bioregulator that enters cells and interacts with DNA to activate brain-protective protein production. Reduces brain cell death and enhances neuronal repair.
NA-Semax Amidate
Enhanced Semax with modifications for better absorption and potency. Stronger BDNF boost with longer-lasting cognitive benefits.
Compare
Selank and Semax are both Russian-developed nootropic peptides approved for clinical use in Russia, making them among the few peptides with actual regulatory approval (outside the US). They are often compared because both target cognitive function, but through very different neurotransmitter pathways.
Dihexa vs SemaxDihexa and Semax are both studied for cognitive enhancement, but they differ dramatically in evidence level and risk profile. Semax is an approved medication in Russia with decades of clinical data, while Dihexa is a potent research compound with limited safety data beyond animal studies.
Semax vs Cerebrolysin: Nootropic Peptide ComparisonSemax and Cerebrolysin are both neuropeptides with decades of clinical use in Russia and Europe, yet they differ fundamentally in origin, administration, and mechanism. Semax is a synthetic heptapeptide analog of ACTH(4-10) originally developed at the Institute of Molecular Genetics in Moscow. Cerebrolysin is a porcine brain-derived peptide preparation containing a complex mixture of neurotrophic factors and free amino acids, manufactured by EVER Neuro Pharma in Austria. Both target brain-derived neurotrophic factor (BDNF) pathways and have been studied for cognitive enhancement, neuroprotection, and neurological recovery -- but they occupy very different niches in terms of convenience, evidence base, and intended use cases.
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