Semax
Synthetic ACTH Analog | Cognitive Enhancement Peptide
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What is Semax?
Semax is a lab-made peptide modeled on a small fragment of ACTH, a natural hormone, engineered to reach the brain quickly through the nose rather than through the bloodstream. Researchers have studied it — mainly in Russia, and in animal and small human studies — for its effects on memory, attention, and recovery after brain injury. It's supplied here strictly as a research chemical for laboratory study, not for human or animal treatment.
Key terms:
Semax is a synthetic heptapeptide.
Semax is a lab-made peptide of seven amino acids. It comes from fragment 4-10 of ACTH, a hormone the body makes naturally. Researchers have studied it extensively for effects on cognition, nerve protection, and brain repair. It was originally developed in Russia for stroke recovery. Studies report it quickly raises BDNF (a protein that supports nerve cell growth) and shifts dopamine and serotonin signaling, which researchers link to memory, focus, and cognitive function.
Key research areas
- Rapid brain delivery via intranasal administration
- Extensive clinical research supporting cognitive enhancement
- Easy self-administration
- Excellent bioavailability to brain regions
Researched dosing
This table reflects how researchers have structured semax study designs — the dose ranges and intranasal delivery methods used in published and reported protocols, presented as research methodology, not personal usage instructions.
| Phase | Dose | Frequency | Route |
|---|---|---|---|
| Cognitive studies (healthy adults) | 300-600mcg | 1-2 times daily | Intranasal spray/drops |
| Learning and memory studies | 600-900mcg | 2-3 times daily during study periods | Intranasal spray/drops |
| Brain-injury recovery studies | 900-1500mcg | 2-3 times daily | Intranasal drops (clinical supervision) |
| Mental-fatigue studies | 400-800mcg | Single morning dose | Intranasal spray |
| Experimental study protocols | 250-1000mcg | Variable based on study design | Standardized intranasal delivery |
Commonly cycled 4 weeks on, 2+ weeks off.
How it works
At the cell level, semax research looks at how the peptide travels from the nose directly toward brain tissue, bypassing the bloodstream, and how it may influence brain chemicals linked to focus and memory — the terms below are just the names for those signaling steps.
Direct transport through olfactory epithelium and trigeminal nerves, bypassing blood-brain barrier for enhanced CNS penetration
Pharmacokinetics
This chart shows how quickly a research dose of semax is absorbed and cleared in the reported data — notice how fast-acting it is, clearing within roughly 15 minutes, which is part of why intranasal dosing protocols in the literature use multiple doses per day.
- Peak
- 0.333 hr
- Half-life
- 0.05 hrs
- Cleared
- ~0.25 hrs
Russian pharmaceutical data
Research applications
This section lists the research areas — memory, attention, and neuroprotection — that scientists have studied for semax; it's a summary of what's been investigated in the literature, not a list of conditions it treats in people.
Cognitive
Improved short-term and working memory performance in fatigued individuals and healthy subjects. Enhanced sustained attention during demanding cognitive tasks and prolonged work periods. Faster acquisition of new information and improved retention in educational and training settings.
Neuroprotective
Neuroprotective effects demonstrated in stroke recovery with increased BDNF levels correlated with early rehabilitation and accelerated restoration of brain functions.
Neuroplasticity
Increased fMRI default mode network activity indicating enhanced neural connectivity and cognitive processing. Gene expression changes affecting immune and vascular systems during ischemia.
Dosage reference
- Doses used in research
- 300–600 mcg per dose
- Frequency in studies
- 1-2 times daily, preferably morning and early afternoon
- Handling
- Reconstituted solution — research use only; not for administration
- Timeline reported in studies
- Onset 15-30 minutes, peak 1-2 hours, duration 4-6 hours
- Storage
- Refrigerate at 2-8°C, do not freeze, protect from light
- Cycle length
- 2-4 weeks continuous use maximum
- Break between cycles
- 1-2 weeks break between cycles to maintain effectiveness
Interactions
This list shows which other nootropic and recovery-focused peptides researchers study alongside semax, and flags combinations that call for extra caution in a research setting.
Reconstitution & storage
This describes how a research-grade semax sample is prepared from powder into a nasal research solution — a standard lab dissolving process, not a personal-use guide.
- Semax nasal formulations come pre-mixed as 0.1% or 1% solutions
- For research use, lyophilized powder can be reconstituted with sterile saline
- Use preservative-free saline for nasal administration to avoid irritation
- Calculate concentration based on desired mcg per spray or drop
- Store reconstituted solution refrigerated and use within recommended timeframe
- Always use sterile technique when preparing nasal formulations
- Store the reconstituted solution refrigerated (2–8°C), labeled with the date and concentration, for laboratory research use only.
Lyophilized: Room temperature, cool dark place, use within Per manufacturer specification
Reconstituted: 2-6°C, use within 24-48 hours (sterile saline) or up to 28 days (BAC water)
Open the Semax reconstitution calculatorQuality indicators
These are the checks researchers use to confirm a semax sample is pure, correctly concentrated, and free of contamination before it's used in a study — a quick reference against a Certificate of Analysis (COA).
Clear, colorless solution - Semax nasal solution should be transparent without particles or cloudiness
Proper concentration labeling - Clearly marked as 0.1% or 1% Semax with accurate mcg per spray information
Cold chain shipping - Nasal formulations should arrive with cold packs and require immediate refrigeration
Sterile packaging - Sealed nasal spray bottles or ampoules with sterility assurance
Nasal irritation potential - Some mild nasal discomfort possible - discontinue if severe irritation occurs
Crystallization or precipitation - Any visible crystals or particles indicate degradation or contamination
What to expect
This timeline summarizes what the available research and reported literature describe at each stage of study — research context for comparing findings, not a personal-results promise.
Initial cognitive clarity and focus enhancement, possible mild nasal sensation
Improved attention span and mental stamina during demanding tasks
Enhanced memory consolidation and learning capacity, stable mood effects
Peak cognitive benefits with improved stress resilience and mental flexibility
Safety notes
This section covers handling cautions and regulatory notes for semax in a laboratory setting — research-use-only scope, not medical guidance for people.
- Do not exceed 4-week continuous use periods without medical supervision
- Avoid concurrent use with other intranasal medications that cause vasoconstriction
- Potential to enhance effects of stimulants - reduce other stimulant doses accordingly
- Not FDA approved; originally developed in Russia for pharmaceutical use
- Research compound - for research purposes only in many jurisdictions
Regulatory status
- Not approved by the FDA for any indication.
- Supplied and described for laboratory research use only — not for human or veterinary use.
Community data
Community Insights
Based on data the community reported. Not clinical proof.
Frequently asked questions
What is Semax?
Semax is a synthetic heptapeptide — a chain of seven amino acids — derived from a fragment (4-10) of adrenocorticotropic hormone (ACTH). Originally developed in Russia, it has been studied in animal models and small human studies within nootropic, neuroprotective, and neurorestorative research. Lux BioPure supplies it strictly as a research chemical for laboratory study, not for use in people or animals.
What class of compound is Semax?
Semax is classified as a synthetic heptapeptide — a short peptide of seven amino acids modeled on the ACTH 4-10 fragment. In the research literature it is characterized by its distinct route of central-nervous-system delivery, with studies describing transport through the olfactory epithelium and trigeminal nerves rather than the bloodstream. It is handled purely as a laboratory research material.
How is Semax typically prepared for research use?
Semax is often supplied as a pre-mixed 0.1% or 1% solution; where lyophilized powder is used, laboratory protocols reconstitute it with sterile, preservative-free saline using sterile technique, calculating concentration by the target micrograms per drop. The reconstituted solution is then refrigerated. This describes standard peptide-handling methodology for research samples, not a usage instruction for people.
How should reconstituted Semax be stored in the lab?
Lyophilized Semax is generally kept at room temperature in a cool, dark place per manufacturer specification. Once reconstituted, the solution should be refrigerated at roughly 2–6°C and used within about 24 to 48 hours when prepared with sterile saline, or up to 28 days with bacteriostatic water. A good sample stays clear and colorless; crystallization or particles indicate degradation.
Is Semax legal to purchase for research in Canada?
Lux BioPure sells Semax in Canada strictly as a research-use-only chemical for laboratory study — it is not for human or veterinary use and is not offered as a drug or supplement. Semax is not an FDA-approved drug; it was originally developed in Russia for pharmaceutical use and remains a research compound in many jurisdictions.
References
110 patients recovering from ischemic stroke showed increased BDNF levels correlated with early rehabilitation and accelerated restoration of brain functions, especially movement-related symptoms (2018)
View Study24 healthy middle-aged participants showed increased fMRI default mode network activity relative to placebo, indicating enhanced neural connectivity and cognitive processing (2018)
View StudyGenome-wide study revealed Semax affected expression of 96 genes related to immune and vascular systems, demonstrating immunomodulating effects and influence on vascular system during ischemia (2014)
View Study