What Is Semax?

Semax (Met-Glu-His-Phe-Pro-Gly-Pro) is a synthetic analog of ACTH(4-10), the fragment of adrenocorticotropic hormone responsible for cognitive and neuroprotective effects — without the hormonal (steroidogenic) activity of full ACTH.

The peptide was developed over two decades by a team led by Nikolai Myasoedov at the Russian Academy of Sciences. It was designed to retain the nootropic and neuroprotective properties of ACTH while eliminating its hormonal side effects.

Semax has been prescribed in Russia since 2001 for conditions including:

• Ischemic stroke recovery
• Cognitive disorders and memory impairment
• Optic nerve disease
• Peptic ulcers (via the ACTH pathway's role in stress response)

It is available in Russia as a nasal spray under the brand name Semax® in 0.1% and 1% concentrations.

Semax works through multiple complementary neurological pathways:

• BDNF upregulation: Semax significantly increases Brain-Derived Neurotrophic Factor expression — a key protein for neuronal survival, growth, and synaptic plasticity
• NGF and GDNF elevation: Also boosts Nerve Growth Factor and Glial cell line-Derived Neurotrophic Factor, supporting broader neuronal health
• Monoamine modulation: Influences dopamine, serotonin, and norepinephrine signaling — contributing to improved mood, focus, and motivation
• Anti-inflammatory neuroprotection: Reduces neuroinflammatory cytokines and protects neurons from oxidative and excitotoxic damage
• Gene expression changes: Transcriptomic studies show Semax modulates hundreds of genes involved in neuronal survival, immune response, and vascular function

This multi-target approach explains why Semax shows benefits across such diverse neurological applications — from acute stroke to chronic cognitive decline.

Clinical and preclinical research has documented several significant benefits:

• Cognitive enhancement: Improved memory, attention, and information processing in both healthy subjects and those with cognitive impairment
• Neuroprotection: Demonstrated protection against ischemic brain damage in stroke models, with improved neurological outcomes
• Mood and motivation: Through dopaminergic and serotonergic modulation, Semax may reduce anxiety and improve motivation without stimulant-like effects
• ADHD support: Russian clinical data suggests benefits for attention and executive function in ADHD-like presentations
• Optic nerve health: Approved in Russia for optic nerve diseases with demonstrated improvements in visual function
• Immune modulation: Semax influences immune cell gene expression, with potential applications in neuroinflammatory conditions
• Rapid onset: Intranasal administration provides effects within minutes, with peak activity at 30–60 minutes

Semax is primarily administered intranasally, though subcutaneous injection protocols also exist:

Intranasal (Most Common)

• Standard dose: 200–600 mcg per day, divided into 2–3 administrations
• Concentration: 0.1% solution (100 mcg per drop) for general nootropic use; 1% solution (1 mg per drop) for neuroprotective applications
• Duration: 10–14 day courses, with breaks of 1–2 weeks between courses

Subcutaneous Injection

• Dose: 100–500 mcg per day
• Duration: Similar 10–14 day cycling

Semax variants also exist: N-Acetyl Semax and N-Acetyl Semax Amidate (NASA) are modified versions with potentially enhanced potency and duration, though with less clinical data.

Dosages based on Russian clinical protocols. Consult a healthcare provider for guidance.

Semax has an extremely favorable safety profile, documented across decades of clinical use in Russia:

• No significant adverse effects: Clinical studies and decades of prescription use report minimal side effects
• Nasal irritation: Mild, transient irritation with intranasal use — the most commonly reported complaint
• Mild headache: Occasionally reported, typically at higher doses
• No hormonal effects: Despite being derived from ACTH, Semax does not stimulate cortisol production or affect the adrenal axis
• No dependence or withdrawal: Research shows no evidence of tolerance, dependence, or withdrawal symptoms

Semax is considered one of the safest nootropic peptides available, with a therapeutic index significantly wider than most pharmacological cognitive enhancers. It is not banned by WADA.

Quality Semax requires precise synthesis and proper formulation, especially for nasal spray preparations. We recommend Ascension Peptides:

• 99%+ purity verified via HPLC and mass spectrometry
• Multiple formats including lyophilized powder and pre-made nasal spray
• Batch-specific COAs publicly available
• US-based shipping with proper storage and handling

Ascension Peptides is a DailyVial affiliate partner. For nootropic peptides like Semax, purity directly impacts efficacy — sourcing from a verified vendor is non-negotiable.