The Cognition Stack pairs the two most-referenced Russian nootropic peptides. Selank flattens the anxiety floor, Semax raises the focus ceiling — together they produce the calm, high-signal cognitive state most single nootropics chase.

Longevity & Cognition

Selank · 10mg

Anxiolytic nootropic — calm, focused clarity.

Longevity & Cognition

Semax · 30mg

Russian nootropic. Memory, focus, neuroprotection.

Research library

Combined mechanism

Curated from public preclinical literature. All content is educational.

Selank is a synthetic tuftsin analog with anxiolytic effects mediated through enkephalin degradation and GABAergic modulation, without benzodiazepine-style dependence.

Semax modulates BDNF and NGF expression in the hippocampus and prefrontal cortex, with documented neuroprotective effects in stroke and TBI models.

Both are intranasal peptides with rapid CNS uptake; effects are typically felt within 15–30 minutes and last 4–8 hours per dose.

The pairing is dose-independent: they act on separate systems (Selank anxiolytic, Semax focus/neurotrophic), so they can be combined without receptor competition.

Reconstitution

Kit prep

Both Selank and Semax are typically supplied for intranasal use. Reconstitute each with 2 mL BAC water and transfer to a nasal spray bottle (not included). One 100 mcL spray from a standard atomizer delivers ~500 mcg Selank or ~1.5 mg Semax.

Reference only. Assumes U-100 syringe (100 units = 1 mL). Not medical advice.

Dosing

Protocol references

Selank: 250–500 mcg intranasally, 1–3× daily. Onset within 20 minutes; best used before high-load or high-anxiety cognitive work.

Semax: 500–1000 mcg intranasally, 1–2× daily. Morning and midday dosing avoids interference with sleep.

Both peptides can be run continuously; some researchers pulse Semax (5 days on, 2 off) to maintain sensitivity.

Storage

Refrigerate reconstituted vials at 2–8°C. Use within 30 days. Lyophilized vials stable ≥12 months at −20°C.

FAQ

Common questions

Are Selank and Semax injectable?+

They can be, but intranasal is the primary studied route and how KINETYX-supplied vials are typically used. BAC water reconstitution works for both routes.

Will this make me sleepy?+

No. Selank is anxiolytic without sedation — it removes anxious noise rather than adding sedative tone. Semax is mildly activating.

Can I stack with caffeine?+

Yes. Semax and caffeine are frequently combined; the pairing typically improves focus without the jitter caffeine alone produces.

Why only 2 vials in this stack?+

Selank and Semax cover the two ends of the cognitive spectrum (calm and focus) without needing a third compound. Adding more increases complexity without improving the response.

Shipping

Fulfillment & returns

Processing

Orders placed by 2pm ET ship same day.

Delivery

Overnight or 2-day, tracked, ambient shipping.

Free shipping

Orders over $150 ship free within the US.

Returns

Unopened vials returnable within 14 days. Batch-verified refunds always honored.

Customer reviews

What researchers are saying

4.8/ 5

Based on 4 verified & seeded reviews

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My go-to source now
Aug 24, 2026
No injection site irritation whatsoever. Peptide profile has been predictable across two batches.
R. PatelBiohacker✓ Verified buyer
Solid results, batch matched CoA
Aug 28, 2026
Been running a conservative research protocol for four weeks. Response curve is consistent with published literature.
J. ChenClinician✓ Verified buyer
Solid results, batch matched CoA
Aug 12, 2026
Compared this side by side with two other suppliers. KINETYX was the only one that documented concentration verification.
M. AlvarezWellness
Solid results, batch matched CoA
Aug 16, 2026
Been running a conservative research protocol for four weeks. Response curve is consistent with published literature.
P. SinghEndurance athlete✓ Verified buyer