The Selank/Semax blend pairs two short synthetic peptides developed in Russian research for cognitive and anxiolytic applications. While both are more commonly used intranasally, injectable blends exist. A common formulation is 10 mg of each for a 20 mg total vial.
Blended-vial calculator
For vials containing 2+ peptides in one lyophilized powder. Enter each
component's mg — the calculator handles the proportional math.
Heads up:
The math uses the sum of your component mg values, not the stated total.
This is common on vendor labels — excipients, copper-ion mass, or rounding.
Draw to
—
units on the syringe
Equivalent volume: — mL
Draw exceeds syringe capacity.
Split across multiple draws or use a larger syringe.
Volume is too small to measure accurately.
Consider adding more bacteriostatic water to dilute.
Per-injection component breakdown
Component
Delivered per dose
Free download
Free Illustrated Reconstitution Guide (PDF)
8-step visual walkthrough with photos and tips — from gathering supplies to drawing your dose. Educational only — not medical advice.
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Components in the Selank/Semax Blend
Each peptide in this blend has its own individual calculator page with factual information on vial sizes,
reported half-life, and storage. Compositions vary by vendor — the mg ratios above are defaults based on
commonly cited formulations.
Selank — A synthetic heptapeptide analog of the endogenous immunomodulatory tetrapeptide tuftsin, studied for anxiety-related signaling.
Semax — A synthetic heptapeptide derived from a modified ACTH 4-10 fragment, studied for neurotropic signaling without classical adrenocortical activity.
How to use this calculator
The Selank/Semax Blend calculator handles two dose-targeting modes:
Target total blend dose — "I want 2 mg of the blend per injection."
The calculator returns the draw volume and reports how much of each component you're getting at that draw.
Target specific component — "I want 250 mcg of BPC-157 specifically."
The calculator back-calculates the draw from that component's concentration, and reports incidental
amounts of the other components delivered at the same draw.
If your vial's stated total mg differs from the sum of component mg values (common on vendor labels —
rounding, copper-ion mass, excipients), the calculator flags the mismatch and uses the component sum
as the authoritative total for math purposes.
Selank/Semax Blend FAQ
What is the Selank/Semax Blend?
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A combined vial containing Selank and Semax, two synthetic peptides developed in Russia and commonly discussed in nootropic contexts.
Are Selank and Semax more commonly used intranasally?
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Yes — most published research and user reports use the intranasal form. Injectable blends exist and are the form this calculator handles. If you have an intranasal spray, the math is different and this calculator does not apply.
How do I compute a dose?
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Use the calculator above — enter component mg, water volume, and target dose. The calculator returns draw and per-injection amount of each peptide.
