Russian Nootropic Stack: peptide dosing guide, Semax + Selank (2026)

The Russian Nootropic Stack combines two short-chain peptides developed at the same Russian research institute: Semax and Selank. The community also calls this combo the Semax-Selank Stack, the NeuroFocus Stack, or just the Russian Stack. Semax is the activator - it boosts brain-derived neurotrophic factor (BDNF), increases dopamine activity, and protects neurons under stress. Selank is the stabilizer - it boosts GABA (your brain's main calming signal), steadies serotonin, and reduces anxiety without making you foggy.

Used alone, Semax can feel overstimulating. Used alone, Selank is calm but doesn't have the cognitive kick. Together, the stack targets what the community calls 'calm focus' - sharp attention without jitteriness, emotional reactivity, or post-use crashes.

Need broader context on combining peptides? See PepPal's stacking safety guide. For supplier and quality-control sourcing, see the PepPal supplier directory.

Two route options are common: subcutaneous injection (more consistent absorption, easier to dose precisely) and intranasal (the original Russian-approved route, no needles). The dosing tables below cover both. Most users pick one route and stick with it; some switch based on lifestyle. Both routes work.

Both compounds are sold in Russia as nasal sprays - Semax as a 0.1% or 1% solution, Selank as a 0.15% solution. Researchers using intranasal reconstituted peptides typically follow these patterns:

The Russian Nootropic Stack is a two-peptide protocol combining Semax and Selank - both short 7-amino-acid peptides (heptapeptides) developed at the Institute of Molecular Genetics of the Russian Academy of Sciences. Both compounds are registered as pharmaceutical drugs in Russia. Semax is on Russia's List of Vital & Essential Drugs and has been used clinically since the 1990s, mostly for stroke recovery and cognitive disorders. Selank is approved in Russia for generalized anxiety disorder and neurasthenia (a chronic fatigue and weakness condition).

Outside Russia, neither compound is FDA-approved. Both are sold as research-use peptides in the U.S. and other markets. The stack itself is community-derived - it pairs the two compounds because researchers and clinicians noticed they work on different but complementary pathways.

Semax is a fragment of ACTH (adrenocorticotropic hormone) that was engineered to keep the brain-boosting effects of the parent molecule while removing the hormonal activity that triggers cortisol. In plain terms: it activates the parts of your brain involved in attention and learning without raising your stress-hormone levels. Semax rapidly increases BDNF (a protein your brain uses to form and strengthen connections), boosts dopamine and serotonin activity, and protects brain cells from stress-related damage.

Selank is a synthetic version of tuftsin, a small immune-related peptide that occurs naturally in your body. It works in two ways: it enhances GABA signaling (your brain's main calming neurotransmitter) and stabilizes serotonin. In Russian clinical trials, Selank's anxiety-reducing effect was comparable to benzodiazepines like medazepam and phenazepam - but without sedation, tolerance, or withdrawal.

The simplest way to picture the pairing: Semax is the gas pedal, Selank is the brakes. Each one fixes a weakness in the other.

Adding a second compound to Semax (or Selank) only makes sense if it covers something the first one misses. Here is how each piece fits together.

Semax is one of the most powerful known triggers of BDNF (brain-derived neurotrophic factor) - a protein your brain uses to form new connections and strengthen existing ones. It rapidly increases BDNF and a related growth factor called NGF in the hippocampus and frontal cortex (the brain regions most involved in memory and decision-making).

Here is where Selank adds value: anxiety and chronic stress actively suppress BDNF production. By calming the nervous system and lowering baseline anxiety, Selank may remove a brake that would otherwise blunt Semax's brain-building effects. The result is potentially more cognitive improvement than either compound alone.

Semax boosts dopamine and serotonin activity in the brain, which sharpens attention, motivation, and processing speed. The catch: boosting dopamine without a counterweight can tip into overstimulation, irritability, or anxious restlessness - side effects some users report with Semax alone at higher doses.

Selank provides that counterweight. It enhances your brain's calming GABA signals - the same system that anti-anxiety medications target - but without sedation, tolerance buildup, or mental fog. The net effect is 'focused calm': the sharpness of dopamine-driven focus without the jittery edge.

Both compounds help you handle stress, but at different timescales. Semax protects brain cells from stress-related damage and reduces harmful inflammation at the genetic level - this is long-term protection. Selank activates calming brain signals and stabilizes your body's natural pain-relief molecules (enkephalins), which directly dampens the physical anxiety response - this is real-time calm.

Together, the stack provides two layers of stress resilience: long-term brain protection (Semax) plus real-time emotional steadiness (Selank). This is the most-cited reason for using the combination during sustained high-pressure periods - exam preparation, executive decision-making, or deadline-driven creative work.

Both compounds influence the immune system through different pathways. Semax affects how the body produces immune-signaling molecules. Selank helps regulate the balance between different types of immune responses - effects measured in human anxiety patients. The practical implication: when you're pushing hard mentally and physically, both compounds may help your immune system stay resilient. This is a secondary benefit, not the main reason to use the stack.

Each compound is reconstituted on its own. The math below mirrors the Semax protocol page and the Selank protocol page so the numbers match across the site.

A few suppliers sell pre-blended Semax/Selank vials or nasal solutions. Always verify the actual mg breakdown of each compound on the vial label before reconstituting. Pre-blends are convenient but lock the ratio between the two compounds. For intranasal nasal sprays, Russian clinical products use 0.1% Semax (1 mg/mL) and 0.15% Selank (1.5 mg/mL), with 2-3 drops per nostril delivering roughly 200-300 mcg per administration.

Both Semax and Selank have favorable safety profiles backed by decades of Russian clinical use. Semax is on Russia's List of Vital & Essential Drugs. Selank's anxiety-reducing effect was compared favorably to benzodiazepines in clinical trials - without sedation, tolerance, or withdrawal. No clinical trial has tested the combined stack, so the concerns below are theoretical, based on what each compound does individually.

Neither compound produces sedation, dependence, tolerance, or withdrawal in published clinical trials. This is one of the cleaner safety profiles in the nootropic peptide space and a major reason Selank has been studied as a benzodiazepine alternative for anxiety.

Approved in Russia since the 1990s and added to the List of Vital & Essential Drugs in 2011. A 110-patient stroke rehabilitation trial (Gusev et al., 2018) showed increased plasma BDNF and accelerated functional recovery. An fMRI pilot in 24 healthy volunteers (Lebedeva et al., 2018) demonstrated altered default mode network activity. Extensive Russian clinical use for stroke, cognitive disorders, and optic nerve disease.

See the Semax protocol page for the standalone reference.

Approved in Russia for generalized anxiety disorder and neurasthenia. A 62-patient trial (Zozulia et al., 2008) showed anxiety-reducing effects comparable to medazepam (a benzodiazepine) with additional anti-fatigue effects. A 60-patient trial (Seredenin et al., 2014) showed similar results vs phenazepam, with cognitive benefits and quality-of-life improvements. An fMRI study (Bakhmet et al., 2020) showed specific amygdala-cortex connectivity changes.

See the Selank protocol page for the standalone reference.

In plain terms, the Russian Nootropic Stack pairs two complementary strategies. Semax builds cognitive capacity (brain growth factors, dopamine-driven focus, neuroprotection). Selank creates the emotional stability (calm nervous system, steady mood, reduced anxiety) needed to actually use that capacity under pressure. The evidence for each compound is solid; the evidence for the specific combination remains theoretical.

The two most common alternatives are Semax alone (simplest option) and the three-compound Triple Nootropic Stack that adds DSIP for sleep optimization. The table below shows how the three approaches compare.