Dose calculator

Selank dose calculator

Convert any Selank dose into syringe units in real time, pre-filled with a 5 mg / 2 mL example.

iPhone · Free to download

Last updated: May 13, 2026

Vial (mg)

Diluent (mL)

Dose (mg)

Dose unit

Draw on a U-100 syringe

12.0 units

Volume to draw

0.120 mL

Selank is a peptide that people explore for its potential effects on anxiety and brain function, often talked about in nootropic circles. It is a synthetic version of a natural peptide found in the spleen called tuftsin, but with a more stable structure that allows it to last longer in the body. Early-stage studies have reported its influence on the balance of certain brain chemicals and proteins involved in nerve growth, which may be linked to mood, learning, and stress resilience. This page covers what the research says about Selank, common ways people track it, and how to use the app’s calculators to stay organized.

How the Selank dose calculator works

Selank doses are 250-400 mcg, taken daily as a sub-Q injection (or intranasally as a spray). On a 5 mg vial mixed with 2 mL water (2.5 mg/mL), a 300 mcg dose draws 12 units. Most cognitive-research protocols run 2-4 week cycles.

The formula is volume in mL equals dose mg divided by concentration mg/mL, then volume times one hundred to get units on a U-100 insulin syringe. With a 2.5 mg/mL Selank solution and a 0.3 mg dose, the draw is 0.12 mL or about 12 units. Type any other dose and the unit count updates in real time — no spreadsheets, no guesswork.

Inputs that genuinely matter: concentration (which only changes when you reconstitute a new vial) and dose mass. Syringe type matters too, but only because U-100 vs U-40 changes the multiplier — almost every modern insulin syringe is U-100, which is why the math defaults to that. Edge cases worth flagging: switching from mcg to mg without checking the input unit, or carrying yesterday's unit count over to a new vial that was reconstituted with a different volume of BAC water.

Figuring out the correct amount of liquid for your desired Selank dose is fundamental to accurate tracking. The Dose Volume Calculator is designed to do this specific job for you. It takes the guesswork out of the equation by using the concentration of your mixed solution. To use it, you first input your vial’s details: your vial contains 5 mg of peptide and you’ve mixed it with 2 mL of diluent. Then, you simply enter your target dose for the day. For example, if you want to take 0.3 mg of Selank, the calculator will instantly determine the precise volume of liquid you need to draw into your syringe. This ensures every dose is consistent with your intended protocol.

This tool is especially helpful because it translates the abstract concept of milligrams (a weight) into a practical, measurable volume (milliliters). For a 0.3 mg dose from a solution that has 2.5 mg of Selank per mL, the calculator will show you that you need to draw 0.12 mL. Trying to eyeball this amount on a syringe would be very difficult and prone to error. By relying on the calculator, you can be confident that you’re administering the amount you planned to, which is crucial for tracking its effects accurately over time. Whether you’re just starting with a low titration dose or have settled on a steady daily amount, this calculator is your go-to for ensuring dose-to-dose consistency.

As you adjust your protocol, this calculator remains an essential partner. If you decide to increase your daily dose from 0.3 mg to 0.4 mg to see if it enhances the effects you are tracking, you don’t need to redo all the math from scratch. You simply change the “Desired Dose” input, and the calculator provides the new volume instantly. This allows for flexible and precise adjustments, empowering you to fine-tune your tracking protocol based on your own observations and goals. It simplifies the process, letting you focus on your experience rather than on manual calculations.

Worked example

Walking one Selank dose through the math

The vial holds 5 mg of Selank, mixed into 2 mL of bacteriostatic water — concentration 2.50 mg/mL.
Your 0.3 mg dose ÷ 2.50 mg/mL = 0.120 mL of solution to pull.
Multiply by 100 (because U-100 means 100 units per mL): 0.120 × 100 = 12 units.
Double the dose to 0.6 mg and the unit count doubles to 24 — the relationship is linear at a fixed concentration.
Change the diluent volume and every one of these numbers moves; change the dose alone and only the last one does.

Selank titration ladder at this concentration

What different Selank dose steps draw on a U-100 insulin syringe at the example 2.50 mg/mL concentration.

Dose (mg)	Volume (mL)	Units (U-100)
0.15	0.060	6
0.3	0.120	12
0.6	0.240	24
1.2	0.480	48

Doubling the Selank dose doubles the unit count. Halving it halves the count. Step-ups under 5 units are hard to read accurately — re-reconstitute with more water if your titration hits that range.

Scenarios people actually run into

Three things that come up logging Selank

You're sitting at the 0.3 mg Selank step and your prescriber bumps you up. The new dose is double — 24 units instead of 12. Same vial, same syringe, twice the volume on the line.
Your fingers reach for the syringe and the unit count from last week is still in your head. Half the time that number is fine; the other half, the vial changed and the right answer moved. The calculator is the second pair of eyes.
You skipped a week. Selank cadence is 7 doses per week, and doubling up to "catch up" almost never reads how people expect — log the skip, then log the next normal dose.

Same-category neighbor

Selank next to Semax

Both sit in the Cognitive bucket — here's the dose math side by side on each one's example vial.

	Selank	Semax
Example dose	0.3 mg	0.4 mg
Concentration	2.50 mg/mL	2.50 mg/mL
Units to draw	12	16

Want the full breakdown? Semax reference →

How Selank dosing is tracked

People who track Selank use often follow specific protocols to organize their usage and observe its effects systematically. A widely discussed approach is cyclical use. This typically involves a defined "on" period, where the peptide is administered daily, followed by an "off" period. A common starting cycle might be for 10 to 14 consecutive days of use, followed by a break of one to three weeks. This pattern is thought to maximize the peptide's observed effects while minimizing the body's potential to build a tolerance to it. During the "on" cycle, consistency is key, with users often taking their dose at around the same time each day to maintain stable levels in their system. The goal of this structured approach is to allow the peptide’s cumulative effects on neurotransmitters and neurotrophic factors to build up.

When starting a Selank protocol, many experienced users suggest a titration or "ramping up" phase. Instead of starting with a full target dose, they might begin with a smaller dose, such as 0.15 mg or 0.25 mg per day, for the first few days. This allows them to assess their personal response and sensitivity to the peptide. Based on their logged experience—tracking metrics like anxiety levels, mental focus, and any side effects—they might gradually increase the dose every few days until they reach their desired level, which commonly falls in the 0.3 mg to 1 mg per day range for many. This careful, methodical approach helps in finding the "sweet spot" where the desired effects are present without any unwanted reactions. Peptide Pilot is an ideal tool for this, as it allows for precise dose logging and note-taking on subjective responses.

The method of administration is a major component of any Selank protocol. The most common method is intranasal, using an atomizing spray bottle. This route is popular because it’s non-invasive and is thought to deliver the peptide more directly to the brain, bypassing the digestive system and first-pass metabolism in the liver. Users meticulously prepare a nasal spray by reconstituting the lyophilized Selank powder with bacteriostatic water and then transferring the solution to a spray bottle. They calculate the dose per spray based on the total volume and peptide concentration. Alternatively, some users opt for subcutaneous injection, which provides a different absorption profile. The choice between these methods often depends on personal preference and the specific outcomes being tracked, with some users reporting different nuances in the effects from each route.

Regardless of the specific dose or administration method, a successful protocol is heavily reliant on consistent tracking. Beyond just logging the dose amount and time, users often keep a detailed journal of subjective experiences. This can include rating anxiety on a 1-10 scale, noting changes in sleep quality, documenting shifts in mood, or recording how easily they can focus on complex tasks. By tagging entries with these qualitative data points in Peptide Pilot, users can look back at their cycle and see correlations between their Selank use and their mental state. This information becomes invaluable for adjusting future cycles, deciding on dose changes, or determining the optimal length for their "on" and "off" periods.

Common Selank dose-calculation mistakes

Inconsistent dosing, such as skipping days during an "on" cycle.
Eyeballing doses instead of using a properly marked syringe for measurement.
Starting with too high a dose instead of titrating up from a smaller amount.

Frequently asked questions about Selank dose calculator

How does the Selank dose calculator turn mg into syringe units?

It runs two divisions in sequence. First it computes concentration (vial mg ÷ diluent mL) — for the example here that's 5 ÷ 2 = 2.50 mg/mL. Then it divides your dose by that concentration to get volume in mL, and multiplies by 100 to convert volume into U-100 syringe units. The output updates as you type so you can sanity-check before drawing. Selank is also commonly used intranasally — sub-Q dose tables don't translate directly to nasal-spray volumes.

Does the Selank dose calculator know which syringe I'm using?

It assumes a U-100 insulin syringe — the most common type for sub-cutaneous peptide injections. U-100 means 100 units per mL. If you're using a U-40 syringe (rare outside veterinary contexts) the unit count is wrong by a factor of 2.5. Tuberculin syringes read in mL directly, so on those just use the volume figure. Selank is also commonly used intranasally — sub-Q dose tables don't translate directly to nasal-spray volumes.

Why does the same Selank dose pull a different unit count today than last week?

Because either the vial or the diluent volume changed. Concentration depends on both. A 5 mg vial reconstituted with 1 mL is twice as concentrated as the same vial with 2 mL — same dose, half the units. Whenever you open a fresh vial, run the dose math again rather than carrying the prior count over. Selank is also commonly used intranasally — sub-Q dose tables don't translate directly to nasal-spray volumes.

What if my Selank dose lands at fewer than 5 units?

That's the calculator telling you the current vial is too concentrated for the dose you want. Five units on a U-100 syringe is hard to read accurately — the markings get tight. Reconstitute the next vial with more bacteriostatic water (commonly 2 mL instead of 1 mL) so each dose covers a larger, cleaner volume. Selank is also commonly used intranasally — sub-Q dose tables don't translate directly to nasal-spray volumes.

Related on Peptide Pilot

Log every Selank dose in the app

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