Dose calculator

Semax dose calculator

Convert any Semax 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

16.0 units

Volume to draw

0.160 mL

Semax is a synthetic peptide that people use to support cognitive functions like memory and focus. It’s a modified piece of a naturally occurring hormone, but it’s designed to work primarily in the brain. Research in its country of origin, Russia, has explored its use in recovery from conditions like stroke, though data from large-scale international trials is limited. This page covers what Semax is, how it’s thought to work, and the common ways people track its use in research settings for brain health and mental performance.

How the Semax dose calculator works

Semax doses are 300-1000 mcg, taken daily as sub-Q injection or intranasal spray. On a 5 mg vial mixed with 2 mL water (2.5 mg/mL), a 400 mcg dose draws 16 units. Cycles tend to run 2-4 weeks, similar to Selank.

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 Semax solution and a 0.4 mg dose, the draw is 0.16 mL or about 16 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.

The Dose Calculator is your essential tool for translating your research goals into a precise, repeatable action. When your protocol calls for a specific milligram (mg) amount of Semax, this calculator does the crucial work of converting that weight into a liquid volume. It uses the vial concentration you set up—for instance, a 5 mg vial mixed with 2 mL of water—to determine exactly how many units to draw into your syringe for your target dose. This precision is vital for credible research; even small dosing errors can change your results, and doing the math manually every time opens the door to mistakes.

Think of this calculator as the bridge between theory and practice. It’s one thing to read that a common dose is 0.4 mg, but it’s another to confidently draw that exact amount. By handling the conversion for you, the tool ensures consistency in your daily protocol. Whether you decide to stick with one dose or titrate up or down, the Dose Calculator provides the accuracy needed to make informed decisions. This allows you to focus less on the arithmetic and more on observing and recording the effects of your Semax cycle, which is the entire point of the research process.

Furthermore, having a dedicated calculator for Semax helps you appreciate how dose changes relate to your supply. As you input different mg amounts, you’ll begin to get a feel for what constitutes a small or large dose from your specific vial. This deeper understanding of the numbers involved fosters a more responsible and knowledgeable approach to your entire peptide research journey. It removes the guesswork, replacing it with the certainty that the dose you are logging is the dose you are actually administering, day in and day out, building a foundation of reliable data.

Worked example

Walking one Semax dose through the math

The vial holds 5 mg of Semax, mixed into 2 mL of bacteriostatic water — concentration 2.50 mg/mL.
Your 0.4 mg dose ÷ 2.50 mg/mL = 0.160 mL of solution to pull.
Multiply by 100 (because U-100 means 100 units per mL): 0.160 × 100 = 16 units.
Double the dose to 0.8 mg and the unit count doubles to 32 — 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.

Semax titration ladder at this concentration

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

Dose (mg)	Volume (mL)	Units (U-100)
0.2	0.080	8
0.4	0.160	16
0.8	0.320	32
1.6	0.640	64

Doubling the Semax 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 Semax

You're sitting at the 0.4 mg Semax step and your prescriber bumps you up. The new dose is double — 32 units instead of 16. 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. Semax 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

Semax next to Selank

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

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

Want the full breakdown? Selank reference →

How Semax dosing is tracked

A common research protocol for injectable Semax often begins with a dose in the range of 200 to 500 micrograms (0.2 to 0.5 mg) administered once per day. For example, a user might decide to track a daily dose of 400 micrograms (0.4 mg) via subcutaneous injection. Due to its short duration of action, some users split their daily dose into two smaller injections, one in the morning and one in the early afternoon, to maintain more consistent effects on focus and mental clarity throughout the day. A typical cycle length observed in community logs is around 10 to 20 days, followed by a "washout" period or break of at least a month. This cyclical strategy is used to assess effects clearly and prevent the user's system from becoming desensitized to the peptide's actions.

Titration is a frequently discussed practice in forums dedicated to peptide research. Many people begin with a dose at the lower end of the typical range, perhaps just 200 mcg, for the first few days. This allows them to gauge their individual response and sensitivity. If the initial dose is well-tolerated and the desired effects on focus or memory are not yet apparent, the user might slowly increase the dose by 50 or 100 mcg every few days. The goal of this careful upward adjustment is to find the minimum effective dose that produces the desired cognitive support without any unwanted side effects. Logging these small adjustments and the corresponding mental and emotional responses is a critical part of a structured research approach, helping the user to personalize the protocol to their unique neurochemistry.

It is impossible to discuss Semax protocols without mentioning its popular nasal spray form. The administration method significantly changes the dosing protocol. For a 0.1% nasal solution, a typical protocol might be 2 drops in each nostril, two to three times per day. The nasal passages provide a more direct route to the brain, and some users report a faster onset of effects with this method. However, dosing can be less precise than with a calibrated insulin syringe. The choice between subcutaneous injection and nasal spray often comes down to the researcher's goals. Injections offer metered, systemic delivery perfect for precise tracking, while the nasal spray offers convenience and rapid, direct-to-brain action that many find effective for in-the-moment cognitive boosts.

Regardless of the chosen method, careful tracking is a cornerstone of any Semax protocol. Users often keep detailed logs of their dose, time of administration, and any subjective effects. This includes noting changes in focus, memory recall, verbal fluency, mood, and energy levels. Some even use brain-training apps or cognitive tests to get more objective data on their performance before, during, and after a Semax cycle. This data-driven approach helps the user move beyond vague feelings and identify concrete patterns in their response. It transforms personal use into a structured experiment, providing valuable insights into how this unique peptide interacts with their own brain and lifestyle, ensuring every cycle is a learning experience.

Common Semax dose-calculation mistakes

Starting with a very high dose instead of titrating up from a lower one.
Confusing the dosing for injectable Semax with the dosing for a nasal spray.
Inaccurate reconstitution math, leading to consistently incorrect doses.

Frequently asked questions about Semax dose calculator

How does the Semax 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. Semax higher-dose protocols (600-1000 mcg) often split into morning + afternoon doses rather than a single bolus.

Does the Semax 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. Semax higher-dose protocols (600-1000 mcg) often split into morning + afternoon doses rather than a single bolus.

Why does the same Semax 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. Semax higher-dose protocols (600-1000 mcg) often split into morning + afternoon doses rather than a single bolus.

What if my Semax 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. Semax higher-dose protocols (600-1000 mcg) often split into morning + afternoon doses rather than a single bolus.

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