Two products wearing one name
In Russia this is a pharmacy item. It comes as a small bottle of nasal drops at two strengths, prescription only, made by a named company under a registration number.
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Reconstitution · Semax
Semax reconstitution calculator
Pick the vial, the water you added and the dose. Get the exact draw in units for the syringe in your hand.
Step 1 of 4
- Vial strengthamount printed on the vial
- Bacteriostatic water addedhow much water you added
- Target doseenter the dose you want to convert
This vial holds 30 mg in total.
- Syringe typematch the label on your syringe
U-100 insulin syringe · 1 mL · lines every 2 units · 1 unit = 0.01 mL
Draw to
40.0units
40.0 units on a U-100 insulin syringe · 1 mL · lines every 2 units, which is 0.40 milliliters. The draw lands on a syringe line.
30 mg ÷ 2 mL = 15.00 mg/mL
→ 150 mcg/unit · 6 mg = 0.400 mL = 40.0 units
→ 150 mcg/unit · 6 mg = 0.400 mL = 40.0 units
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Show the math and syringe details
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How to use the calculator
- STEP 1
Enter the amount in the vial
- STEP 2
Enter the water you added
- STEP 3
Enter the dose you want to convert
Semax is a peptide seven amino acids long, copied from a short stretch of a stress hormone. It carries none of that hormone’s own activity. It is sold as a nootropic, for focus, memory and recovery after a stroke.
In Russia it is a registered prescription medicine given as nasal drops. Stroke patients there have received it for thirty years. That work is Russian-language, and none of it was ever registered as a trial. The clearest published result is a negative one, in 27 people with motor neuron disease.
Examples using a 30 mg Semax vial
Each row starts with the same 30 mg vial and changes only the amount of water. More water makes the mixture less concentrated, so the same dose uses more syringe units.
◆ How the water amount changes the resultdose used: 6 mg
| Water added | Concentration | Per U-100 unit | Draw for 6 mg | Nearest syringe line |
|---|---|---|---|---|
| 1 mL | 30.00 mg/mL | 300.0 mcg | 20.0 u · 0.200 mL | exactly 20 u |
| 2 mL | 15.00 mg/mL | 150.0 mcg | 40.0 u · 0.400 mL | exactly 40 u |
The vial, water and dose shown here are the calculator’s starting example for Semax. Replace them with your own values. Every result in the table is calculated from those inputs.
The amounts on this page went up a nose, not into a needle
This tool converts a powder and water into marks on a barrel. The published amounts for this peptide were not given that way. They were given as drops into the nose, in a country where it is a licensed medicine sold in exactly that form. Everything the calculator returns here carries that gap with it.
Why the route change is not a detail
A membrane inside the nose and a layer of fat under the skin are not two doors into the same room.
One amount on the page is missing on purpose
The figures quoted most often for this peptide online are not on this page, and their absence is deliberate rather than an oversight.
What the literature behind these figures is like
The work is real and it is narrow. It runs through Russian journals, mostly from one research tradition, and it was never registered on any trial registry.
What the opening figure means here
The setting this page opens on is a real published amount rather than a convenience. It is what a large group of stroke patients received each day in the biggest study that names a quantity.
Units to dose at 15.00 mg/mL
Mix 30 mg into 2 mL and one U-100 unit carries 150.0 mcg. The table shows how much peptide is in each numbered syringe line. These are conversion examples, not suggested doses.
| U-100 line | Volume | Mass (mcg) | Mass (mg) |
|---|---|---|---|
| 10 u | 0.10 mL | 1,500 mcg | 1.5 mg |
| 20 u | 0.20 mL | 3,000 mcg | 3 mg |
| 30 u | 0.30 mL | 4,500 mcg | 4.5 mg |
| 40 u | 0.40 mL | 6,000 mcg | 6 mg |
| 50 u | 0.50 mL | 7,500 mcg | 7.5 mg |
| 60 u | 0.60 mL | 9,000 mcg | 9 mg |
| 70 u | 0.70 mL | 10,500 mcg | 10.5 mg |
| 80 u | 0.80 mL | 12,000 mcg | 12 mg |
| 90 u | 0.90 mL | 13,500 mcg | 13.5 mg |
| 100 u | 1.00 mL | 15,000 mcg | 15 mg |
How the math works
- Concentration — divide the amount in the vial by the water you added: mg ÷ mL = mg/mL. This tells you how many mg are in each mL.
- Volume — the dose divided by that concentration: dose ÷ (mg/mL) = mL.
- Units — on a U-100 syringe one unit is 0.01 mL, so mL × 100 = units. A U-40 unit is 0.025 mL, so the wrong barrel is a 2.5× error. That is why the calculator asks which one you have.
- Rounding gap — the exact draw against the nearest syringe line: |exact − nearest line| ÷ exact × 100 = % difference.
Useful guides for this calculation
The math is only one part of the question. These guides cover the compound, published doses, side effects, mixing steps and supplies.
- Gusev EI, Martynov MY, Kostenko EV, Petrova LV, Bobyreva SN. [The efficacy of semax in the tretament of patients at different stages of ischemic stroke]. Zh Nevrol Psikhiatr Im S S Korsakova. 2018;118(3 Vyp 2):61-68 — 110 patients, two ten-day courses of 6000 mcg a day separated by twenty days. Russian; read here through the English abstract indexed in PubMedretrieved 2026-08-13limited human data
- Serdiuk AV, Levitskii GN, Miasoedov NF, Skvortsova VI. [The study of chronic partial denervation and quality of life in patients with motor neuron disease treated with semax]. Zh Nevrol Psikhiatr Im S S Korsakova. 2007;107(4):29-39 — 27 patients given 12 mg a day intranasally as a 1% solution in two ten-day courses. The abstract calls it open-label and reports that Semax did not influence the course of the disease. Russian; read through the indexed English abstractretrieved 2026-08-13limited human data