Selank Dosage Guide: Anxiety and Nootropic Benefits

Selank is a synthetic peptide based on tuftsin, studied in research settings for its effects on anxiety-related and cognitive pathways. It is most often referenced in two delivery formats: a nasal spray and a reconstituted solution for subcutaneous use. This guide explains how the dosage numbers are usually described, the math behind each route, and why Selank is often grouped with peptides that do not build a fast tolerance.

This is reference information only. Selank is a research compound that is not approved for human consumption, and nothing here is medical advice or a recommendation to dose. Numbers below describe how protocols appear in the literature, not what anyone should take. Defer every dosing decision to a licensed clinician.

Typical Selank dosage ranges

Across research references, Selank is commonly cited in a 250 to 500 mcg per administration window, often described once or twice daily. The two routes carry that same per-dose range but reach it differently.

• Nasal: 250 to 500 mcg, frequently split into drops or sprays across both nostrils.
• Subcutaneous: 250 to 500 mcg drawn from a reconstituted vial and injected into fatty tissue.
• Frequency: once daily is the common baseline reference, with twice daily appearing in some protocols.

The active dose is the same either way. The route mostly changes how it is prepared and measured, not the milligram math.

Nasal vs subcutaneous: what differs

The nasal route avoids needles and is the format most premixed Selank sprays use. The tradeoff is that absorption through nasal tissue is less precise than an injection, so the delivered amount per spray can vary. Subcutaneous use gives a cleaner, more measurable dose because you draw an exact volume into an insulin syringe, but it requires reconstitution and an injection. Neither is presented here as better; they are simply two ways the same range is referenced.

Reconstitution math, worked out

Selank usually arrives as a lyophilized powder, often in a 5 mg or 10 mg vial, that has to be mixed with bacteriostatic water before use. The volume of water you add sets your concentration, and concentration is what turns a milligram vial into a per-dose number. Run your own vial through the reconstitution calculator so the units line up before anything is drawn.

Worked example. Take a 10 mg vial and add 2 mL of bacteriostatic water:

• 10 mg in 2 mL = 5 mg per mL = 5000 mcg per mL.
• A 500 mcg dose = 0.1 mL = 10 units on a U-100 insulin syringe.
• A 250 mcg dose = 0.05 mL = 5 units.

Add more water and each unit carries less peptide. The same 10 mg vial reconstituted with 5 mL gives 2 mg per mL (2000 mcg per mL), so 500 mcg becomes 0.25 mL, or 25 units. If unit conversions are where you get stuck, the mg to units calculator handles that step. For the full walkthrough on mixing technique, see how to reconstitute peptides.

The no-tolerance angle

One reason Selank shows up in nootropic discussions is that it is often described as not producing the rapid tolerance buildup associated with some other anxiety-pathway compounds. In research framing, this is part of why it appears in longer daily-use references rather than strict pulse-only schedules. That said, no tolerance claim is a guarantee of safety or outcome, and the compound remains unapproved. Treat any reported tolerance profile as a general research observation, not a reason to extend use on your own judgment.

Cycling references

Even where tolerance is described as low, many Selank protocols still reference defined on and off windows rather than indefinite use. Common patterns cited include several weeks on followed by a break.

• Daily use across a 2 to 4 week block, then a pause.
• Shorter, as-referenced use tied to specific research periods rather than continuous dosing.

For background on how on and off scheduling is generally approached, see how long to cycle peptides. You can browse other research compounds and their tools on the peptides hub.

Storing your vial

Lyophilized Selank is typically kept cold before mixing, and once reconstituted it is usually refrigerated and used within a defined window. See how long do reconstituted peptides last and do peptides need to be refrigerated for storage references.

Selank dosing is mostly a measurement problem once you know your vial size and water volume. Nail the concentration first, pick the route, and leave the rest of the decision to a clinician. Always review the disclaimer before acting on any number here.