How does Semax differ from Selank?
While both are Russian-developed neuropeptides, Semax is derived from ACTH (4-10) and focuses more on cognitive enhancement, neuroprotection, and BDNF stimulation. Selank is derived from tuftsin and has more pronounced anti-anxiety effects. They're sometimes used together.
What is Semax and how does it work?
Semax is a synthetic peptide derived from ACTH (adrenocorticotropic hormone), specifically the 4-10 fragment with an added Pro-Gly-Pro sequence. It works primarily by increasing BDNF (brain-derived neurotrophic factor) and modulating dopamine and serotonin systems. Unlike ACTH, it has no hormonal effects on cortisol.
What is BDNF and why does Semax increasing it matter?
BDNF is a protein that supports neuron growth, survival, and plasticity — essentially "fertilizer for the brain." Higher BDNF is associated with better learning, memory, and mood. BDNF levels decline with age and in depression. By increasing BDNF, Semax may support cognitive function and neural health.
How is Semax administered?
Semax is most commonly used as a nasal spray for direct CNS delivery. Typical dosages range from 200-1000 mcg per day, divided into 2-3 doses. Effects are usually noticeable within 15-30 minutes. It can also be injected subcutaneously. In Russia, it's available as prescription nasal drops.
What cognitive effects does Semax have?
Users report improved focus, concentration, and mental clarity. Research suggests benefits for memory formation and recall, attention, and learning capacity. Some describe it as providing "clean" mental energy without the jitteriness of stimulants. It's used by students, professionals, and those seeking cognitive enhancement.
Is Semax used for any medical conditions?
In Russia, Semax is approved for stroke recovery, traumatic brain injury, cognitive disorders, and optic nerve diseases. It's shown neuroprotective effects in ischemia and may help with ADHD symptoms. Western clinical trials are limited, but Russian medical use provides substantial human data.
Can Semax and Selank be used together?
Yes, the combination is popular. Semax provides cognitive enhancement and focus, while Selank adds anxiolytic and calming effects. Together they may offer balanced mental enhancement — clarity and focus without anxiety. Some find the combination superior to either alone for productivity and well-being.
What are the side effects of Semax?
Semax is generally well-tolerated. Possible side effects include mild nasal irritation (with spray), occasional headache, and rarely dizziness. Some users report hair loss concerns, though evidence is limited. Unlike stimulants, it doesn't cause jitteriness, insomnia, or crash effects. Most users report minimal to no side effects.
How long does reconstituted peptide last?
Once mixed with bacteriostatic water, peptides remain stable for up to 4 weeks when refrigerated at 2-8°C (36-46°F). Unopened powder can last 1+ year in the freezer. Get our complete Storage & Travel Guide.
Is this peptide legal to purchase?
Peptides sold "for research purposes only" are legal to purchase in the US, but are not FDA-approved for human use outside of specific medical applications. Always consult a healthcare provider before use.
New to peptides?
Take our Peptide Match tool to find the best peptide for your goals. You can also read our Complete Guide to Peptides to learn the basics.