Peptide Stack

Selank + Semax

Semax Selank stack · nootropic stack · Selank/Semax

Named cognitive pair — Selank (tuftsin analog) plus Semax (ACTH 4–10 analog). Highest-search nootropic blend on vendor menus. We already have the singles and the N-acetyl/amidate/adamantane cousins. This leaf is the two-peptide SKU. No combined trial; each parent has a Russian clinical literature trail that does not automatically apply to a mixed bottle.

Not FDA-approved — research chemical
Reviewed by CalcMyPeptide Editorial Team
Last updated: April 2026Evidence: Low2 peer-reviewed citations
Typical research dose
Selank 250-750 mcg + Semax 200-600 mcg (intranasal; often split AM/PM)
Frequency
1-3× daily (intranasal)
Half-life
~2–3 min each (parents)
Common vials
5 mg / 10 mg
CAS
N/A (blend)
Dose it
10 mg + 5 mL BAC water → 2 mg/mL · 450 mcg ≈ 23 units (U-100)
Open in calculator

Mechanism of Action

Selank (tuftsin analog) and Semax (ACTH 4–10 analog) are sold as a paired nasal SKU. Each has a Russian clinical literature trail. The combination does not have a RCT. Mixing two short peptides in one bottle does not create a third pharmacology.

Dose each component from its own leaf if the vial is actually two peptides lyophilized together — blend math is still two concentrations, not one “nootropic unit.”

Source: Selank PMID: 18577768; Semax PMID: 17430556

Two peptides, two parents

This is a catalog pair. Read Selank and Semax. N-acetyl, amidate, and adamantane cousins are separate IDs.

Dosing Protocol

Typical DoseSelank 250-750 mcg + Semax 200-600 mcg (intranasal; often split AM/PM)
Frequency1-3× daily (intranasal)
Half-Life~2–3 minutes each (parent peptides; nasal SKUs vary)
Common Vial Sizes5 mg, 10 mg

Dosing Protocols

Intranasal pair (vendor)

Dose
Selank 250–750 mcg + Semax 200–600 mcg
Frequency
1–3× daily
Note: Inherited from the singles. No blend trial.

Administration

Route
Intranasal
Timing
Often Semax earlier, Selank later in community use — folklore, not a label.
Fasting Required?
No — food timing not critical

Expected Timeline

Minutes–hours
Parents are fast. Blend duration is unmeasured.

Who Is It For?

Cognitive research pair

Low

High search. Evidence is the two parent files, not this SKU.

Reconstitution Example

Vial
10 mg
Diluent
5 mL
Concentration
2 mg/mL
Per Unit (100u syringe)
20 mcg
Dose of 450 mcg = 22.5 units on a 100-unit insulin syringe
🧮 Calculate Your Exact Selank + Semax Dose →

Safety & Considerations

Research peptides. Nasal irritation. Not a substitute for diagnosed anxiety, ADHD, or stroke care. Do not confuse NASA (Semax analog) with this mix.

Regulatory & Legal Status

FDA Status (US)
Research Only

Named pair of two research/Russian-literature peptides. Not an approved combination

WADA Status (2026)
Not Listed

Not currently on the WADA 2026 Prohibited List. Policies may change — verify before competition.

Classification

Research Chemical

US Compounding: Not eligible / not available

⚠️ This information is for educational purposes only and may not reflect the most current regulatory updates. Always verify with official FDA, WADA, and jurisdiction-specific sources before use.

Selank + Semax vs. N-Acetyl Semax Amidate

AttributeSelank + SemaxN-Acetyl Semax Amidate
What it isTwo parent peptides in one SKUOne Semax analog (NASA)
EvidenceParent Selank + Semax papers, no blend RCTParent Semax papers only
Typical routeIntranasal pairIntranasal analog

Verdict: The stack is two molecules. NASA is one analog of one of them. Do not dose a mixed bottle as if it were NASA.

Dosing Quick Reference

Selank + Semax— Dosing Guide
Dose Range
Selank 250-750 mcg + Semax 200-600 mcg (intranasal; often split AM/PM)
Half-Life
~2–3 minutes each (parent peptides; nasal SKUs vary)
Frequency
1-3× daily (intranasal)
Route
Subcutaneous
5 mg vial10 mg vial
💧 5 mL BAC water📐 2 mg/mL💉 20 mcg/unit (100u syringe)
Peptide Stackcalcmypeptide.com

Frequently Asked Questions

Is this NASA?▼
No. NASA is N-Acetyl Semax Amidate, a single analog. This leaf is unmodified Selank plus unmodified Semax as a pair.
One reconstitution or two?▼
If it is one blended vial, treat total milligrams as the blend mass and dose in mcg of blend — or, better, use the Blend calculator with two lines if you know the ratio.

References

  1. Seredenin / Institute of Molecular Genetics lineage “Selank (parent).” Russian clinical literature (2008). PMID: 18577768
  2. Ashmarin / Myasoedov lineage “Semax (parent).” Neuroscience literature (2007). PMID: 17430556

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