Peptides

Semax

Evidence: moderate_human

Mechanism of Action

Semax (Met-Glu-His-Phe-Pro-Gly-Pro) is a synthetic heptapeptide analog of the ACTH(4-10) fragment that rapidly upregulates brain-derived neurotrophic factor (BDNF) and its signaling receptor TrkB in the hippocampus (1.4-fold BDNF protein increase, 3-fold exon III BDNF mRNA increase). It activates dopaminergic and serotonergic brain systems, enhances neurotrophin gene expression (BDNF, NGF), and modulates intracellular calcium dynamics in brain neurons. Semax lacks ACTH's corticotropic activity, acting purely as a nootropic/neuroprotective agent.

Dosing Protocol

Standard: Research indicates 200-600 mcg daily via intranasal administration (0.1% solution, 2-3 drops per nostril).

Loading: Research indicates 600-900 mcg daily for the first 5-7 days during acute cognitive demands.

Maintenance: Research indicates 200-400 mcg daily intranasally.

Administration: intranasalsubcutaneous

Timing: Morning and early afternoon dosing (avoid evening — may cause stimulation/insomnia). Intranasal preferred for rapid CNS delivery.

Duration: 10-14 day cycles with equal rest periods. Some protocols use 3-5 day on / 2 day off patterns.

Notes

Semax is approved in Russia and Ukraine as a nootropic and for stroke recovery. The Semax + Selank cognitive stack is the most popular nootropic peptide combination: Semax for dopaminergic stimulation/focus and Selank for GABAergic calming/anti-anxiety. Higher-potency versions (N-Acetyl Semax, N-Acetyl Semax Amidate) are available and may have enhanced CNS penetration. Community reports consistently note improved verbal fluency, focus, and motivation. The 0.1% solution is standard; 1% solution is available for higher dosing.

Stacking

  • Selank
  • P21
  • Noopept

Interactions

  • Selank [LOW] — Synergistic — the Semax + Selank cognitive stack provides complementary stimulating + anxiolytic effects.
  • Stimulants (caffeine, amphetamines) [MEDIUM] — Additive dopaminergic/noradrenergic stimulation; may cause overstimulation.
  • MAO inhibitors [HIGH] — Semax increases monoamine activity; risk of hypertensive crisis with MAOIs.

Contraindications

  • Seizure disorders
  • Acute psychosis or mania
  • Pregnancy and breastfeeding
  • Severe hypertension

Side Effects

  • Nasal irritation (intranasal route)
  • Mild headache
  • Stimulation/insomnia if dosed late
  • Irritability at high doses
  • Hair loss (anecdotal at high doses)

Key Papers

  • 10.1016/j.brainres.2006.07.108
  • 10.1007/s11064-005-8826-8

Source Quality

Russian pharmaceutical-grade (approved in Russia). International access via research-grade suppliers. Pre-made nasal spray preferred over reconstituted.

Disclaimer: This information is for educational purposes only and is not medical advice. BioAccelera Labs does not diagnose, treat, or prescribe. Consult a licensed healthcare provider before using any compound.

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