Semax dosing & administration
A brain-boosting peptide that supercharges your cognitive function by ramping up BDNF—the protein your neurons need to grow, connect, and stay sharp—all delivered through a simple nasal spray.
Written by Michael Carroll — Owner, Director of Research · Reviewed by the Peptide Initiative Research Team · Editorial standards
Dosing
How much do I take?
Intranasal: Sprayed into the nose, where it absorbs through the nasal lining.
Bioavailability Moderate — absorbs through the nasal lining and can partly bypass the gut.
2 documented dose levels — separate regimens, not a titration schedule
250-500 mcg/day
Frequency
Once or twice daily
Duration
1-2 weeks
Timing
Best time to take
Morning administration works best for most people—Semax increases alertness and focus, so taking it late in the day might interfere with sleep. If splitting doses, take the second one before 2 PM.
With food?
Semax can be taken regardless of food since it's administered nasally and absorbs directly into the brain tissue. Food timing doesn't affect its absorption or effectiveness.
If stacking
Semax pairs excellently with Selank for balanced cognitive and anxiolytic effects. When combining with other nootropics like Noopept, start with lower doses of each. Space different nasal peptides 15-30 minutes apart.
Adjusting your dose
Increase if
- You've tolerated the starting dose well for at least a week
- Cognitive benefits are subtle and you want stronger effects
- Your protocol calls for clinical-level dosing under supervision
Decrease if
- You experience persistent headaches or nasal irritation
- You feel overstimulated or have trouble sleeping
- Blood pressure noticeably increases
- Any uncomfortable side effects develop
Signs of right dose
- Noticeably improved focus and concentration
- Better memory recall throughout the day
- Clearer thinking without feeling wired or anxious
- Stable mood and motivation
Administration
How do I use it?
Reconstitution
What you need
Injection
Route
Subcutaneous injection (alternative to nasal) or intranasal spray (preferred for cognitive effects)
Best sites
Storage
Before reconstitution
Keep your Semax powder refrigerated at 36-46°F (2-8°C) for short-term storage or frozen at -4°F (-20°C) for long-term storage. Protect from light and moisture. Properly stored powder remains stable for 2+ years when frozen.
After reconstitution
Store reconstituted solution in the refrigerator at 36-46°F (2-8°C). Never freeze the reconstituted solution. Keep away from light. Nasal spray solution should be used within 30 days for optimal potency.
Signs of degradation — discard the vial
Sample daily schedule
Morning (7-10 AM)
300-600 mcg injection
Site: Intranasal (1-3 sprays per nostril depending on concentration)
Take with or without breakfast—food doesn't affect absorption. This timing maximizes cognitive benefits during your productive hours without interfering with sleep.
Early afternoon (optional second dose, before 2 PM)
200-300 mcg injection
Site: Intranasal (1-2 sprays per nostril)
If splitting daily dose, keep the second administration early enough to avoid sleep interference. Some users find a second dose helps maintain focus through the afternoon.
Safety
Is it safe?
Side effects
Commonly reported: Nasal irritation, Mild headache, Increased alertness
Less common: Temporary blood pressure increase, Dizziness
Stop and seek help if
- Any signs of allergic reaction—stop immediately and seek medical help
- Persistent headaches that don't improve after the first week
- Significant blood pressure increases that concern you or your doctor
- Sleep disruption that doesn't resolve with earlier dosing
- Any side effect that feels serious or significantly impacts your quality of life
- Your planned cycle or research protocol is complete
Semax is a research compound not FDA-approved in the United States (though it is approved in Russia). Never start, stop, or change your dosing without guidance from a qualified healthcare provider. This information is for educational purposes only—not medical advice.
Flagged pairings
- Stimulant medications (Adderall, Ritalin) — Effects may be additive. Use caution and lower doses. Inform your prescriber.
- MAO inhibitors — Semax affects monoamine systems (dopamine, serotonin). Combining with MAOIs could cause unpredictable effects. Avoid.
Published research
What the studies show
Dolotov OV, Karpenko EA, Inozemtseva LS, et al. · 2006
This study showed that a single dose of Semax increased BDNF protein levels by 40% and boosted the activation of its receptor (trkB) in the hippocampus—the brain's memory center. Treated animals performed significantly better on learning tests. This helped explain how Semax improves memory at the molecular level.
Dolotov OV, Karpenko EA, Seredenina TS, et al. · 2006
Researchers discovered that Semax has specific binding sites in the brain and rapidly increases BDNF levels after intranasal administration. The binding was precise (with a dissociation constant of 2.4 nM), confirming Semax isn't just a random peptide—it has a specific target in brain tissue.
Shadrina M, Kolomin T, Agapova T, et al. · 2010
This study mapped how Semax affects two key brain growth factors (NGF and BDNF) across different brain regions. It found that Semax produces a coordinated wave of neurotrophin activation, with effects varying by brain region and timing—revealing Semax's sophisticated, targeted action.
Tabbi G, Magri A, Giuffrida A, et al. · 2015
Beyond its BDNF effects, this study revealed that Semax strongly binds copper ions—a metal linked to neurotoxicity in conditions like Alzheimer's. Semax protected brain cells from copper-induced damage, adding an antioxidant dimension to its neuroprotective profile.
Radchenko AI, Kuzubova EV, Apostol AA · 2025
In mice modeling Alzheimer's disease, both Semax and its derivatives improved cognitive function on multiple tests (open field, object recognition, maze navigation) and reduced amyloid plaque buildup in the brain. This recent research highlights Semax's potential for neurodegenerative conditions.
PEPTOGEN (Innovative Research and Production Center); Vidal Russia · 2026
Official Russian label for Semax 0.1% nasal drops (RU LP-No.(009449)-(RG-RU), prescription-only, on the Russian Vital and Essential Drugs list): a synthetic analogue of ACTH(4-10) completely devoid of hormonal activity; affects memory formation and learning, enhances attention during learning and information analysis, improves memory-trace consolidation. Absorbed from the nasal mucosa, penetrates the blood-brain barrier, does not reach the GI tract. Indications include cognitive disorders in cerebrovascular disease, the recovery period after stroke, states after traumatic brain injury and neurosurgery, optic nerve atrophy and neuritis, and (from age 7) minimal brain dysfunction including ADHD. Daily doses: 400-900 mcg for adaptation/mental-fatigue prophylaxis (dosed in the first half of the day), 600-900 mcg for optic nerve disease, up to 800-8000 mcg for cerebrovascular cognitive disorders. The only listed adverse effect is mild irritation of the nasal mucosa with prolonged use. Contraindicated in acute psychiatric states, anxiety disorders, history of seizures, age under 7, hypersensitivity, pregnancy and lactation.
Mavrych V, Shypilova I, Bolgova O · 2026
Narrative review (Front Aging). For Semax: primary mechanism is BDNF upregulation (1.4-fold hippocampal BDNF protein, 3-fold mRNA, enhanced trkB activation) promoting neuronal survival, synaptic plasticity and neurogenesis; modulates dopamine/serotonin systems; antioxidant pathways described. Russian stroke trials showed improved neurological recovery. States Semax has decades of use in Russia with apparently favorable safety profiles but lacks independent Western validation and systematic safety surveillance; not approved by the FDA or equivalent agencies.
Tomasello MF, Di Rosa MC, Naletova I, Sciacca MFM, et al. · 2025
In vitro: Semax, which has high affinity for Cu(II), extracted Cu(II) from Cu(II)-amyloid-beta complexes, altered their redox cycling and decreased associated reactive oxygen species production, and was cytoprotective for SH-SY5Y neuronal cells against oxidative stress from copper-catalyzed amyloid-beta oxidation.
Kolomin T, Shadrina M, Slominsky P, Limborska S, Myasoedov N · 2013
Review of Semax and Selank by the Institute of Molecular Genetics RAS group that developed them (Neuroscience & Medicine 4:223-252). Replacing the three C-terminal residues of ACTH(4-10) with Pro-Gly-Pro gave the longest-acting analogue (effect 20-24 h vs 30-60 min for ACTH(4-10)); Semax forms relatively stable active intermediates; no corticotropic or melanocyte-stimulating activity. About 0.093% crosses the blood-brain barrier 2 min after intranasal dosing vs ~0.01% after IV, the basis for recommending the intranasal route. Reports dopamine/serotonin effects in rodents, neuroprotection in ischemia including inhibition of oxidative-stress reactions, and that Semax 1% was well tolerated in stroke patients (nasal mucosa discoloration in 10%, mild blood glucose increase in 7.4% of patients with diabetes). Describes Selank as a pronounced anxiolytic that enhances serotonin metabolism.
Eremin KO, Kudrin VS, Saransaari P, Oja SS, et al. · 2005
In rodents, Semax increased striatal 5-HIAA (serotonin metabolite) tissue content by 25% and extracellular levels up to 180%. Semax alone did not alter tissue or extracellular dopamine or its metabolites, but given before D-amphetamine it markedly enhanced amphetamine-induced striatal dopamine release and locomotor activity.
Kost NV, Sokolov OIu, Gabaeva MV, Grivennikov IA, et al. · 2001
Semax (IC50 10 microM) and Selank (IC50 20 microM) dose-dependently inhibited enkephalin-degrading enzymes of human serum, more potently than puromycin or bacitracin; the authors propose this inhibition as one mechanism of their biological activity. Russian-language article with English abstract.
Ashmarin IP, Nezavibat'ko VN, Myasoedov NF, Kamensky AA, et al. · 1997
Review by the developers: Semax stimulates operative memory and attention and increases resistance to hypoxia in animals and humans for 20-24 h after intranasal doses of 0.015-0.050 mg/kg; significantly improves memory and attention in healthy men under extreme conditions; at the time of writing was used to treat patients with CNS diseases, and in no case produced negative side actions or complications. Russian-language article with English abstract.
Vyunova TV, Andreeva L, Shevchenko K, Myasoedov N · 2018
Radioligand study of the anti-anxiety mechanism of Selank: Selank acts as a positive allosteric modulator of [3H]GABA binding in brain membranes and interacts with benzodiazepine modulation of GABA binding.
Head to head
Semax compared
Studied for
Conditions Semax has been researched in
Want the full picture?
The complete Semax research profile: mechanism of action, clinical studies, effectiveness timeline, and FAQ.