> ## Site index > Full index of Peptides.build at https://peptides.build/llms.txt. Use it to discover every page. # Semax & Selank Calculator: Units & Chart Free Semax and Selank calculator for injectable vials: units to draw for 5, 10 and 20 mg vials or a pre-mixed pharmacy vial, a units chart and BAC water tables. URL: https://peptides.build/tools/semax-selank-calculator/ Free tool · Semax + Selank · U-100 syringe units # Semax / Selank CalculatorInjectable units, reconstitution and dosing chart Turn the Semax or Selank dose on your prescription into units on a U-100 insulin syringe, for a powder vial you reconstitute or a pre-mixed vial from a pharmacy. Injectable only; nasal sprays are measured in sprays, not units. Math only · No dose recommendations · Updated October 12, 2026 Draw to 6units 0.06 mL on a 0.3 mL U-100 syringe Concentration 2.5 mg/mL Per unit 25 mcg Dose 150 mcg Doses per vial 33 Tired of reconstituting? Doctor-prescribed peptides from Peptides.build arrive already reconstituted by a licensed US 503A pharmacy, labeled and ready to draw. No BAC water, no math. Attention and calm without stimulant load. [See the Semax / Selank protocol →](https://peptides.build/protocols/semax-selank/) ## Quick answer: how do you calculate Semax / Selank units? To calculate Semax or Selank units, divide the milligrams in the vial by the millilitres of liquid to get the concentration, divide your prescribed dose in milligrams by that concentration to get the volume, then multiply the volume in mL by 100 for units on a U-100 syringe. Semax and Selank are usually separate vials, so run the math once per vial. Example: a 5 mg vial with 2 mL of bacteriostatic water is 2.5 mg/mL, so if your prescription says 150 mcg (0.15 mg), you draw 0.06 mL, which is 6 units. Reference chart ## Semax / Selank dosing chart in units Units to draw on a U-100 syringe for common Semax / Selank vial sizes and water volumes. Find your vial on the left and read across to the dose on your prescription. This is a conversion table, not a dosing recommendation; a dash means the dose is larger than the vial. Semax / Selank units to draw by vial size, bacteriostatic water and prescribed dose | Vial | Water | mg/mL | 150 mcg | 200 mcg | 300 mcg | 500 mcg | 1 mg | | --- | --- | --- | --- | --- | --- | --- | --- | | 5 mg | 1 mL | 5 | 3 | 4 | 6 | 10 | 20 | | 5 mg | 2 mL | 2.5 | 6 | 8 | 12 | 20 | 40 | | 5 mg | 2.5 mL | 2 | 7.5 | 10 | 15 | 25 | 50 | | 10 mg | 1 mL | 10 | 1.5 | 2 | 3 | 5 | 10 | | 10 mg | 2 mL | 5 | 3 | 4 | 6 | 10 | 20 | | 10 mg | 3 mL | 3.33 | 4.5 | 6 | 9 | 15 | 30 | | 20 mg | 2 mL | 10 | 1.5 | 2 | 3 | 5 | 10 | | 20 mg | 4 mL | 5 | 3 | 4 | 6 | 10 | 20 | Values in units (U-100). 1 unit = 0.01 mL. Already reconstituted ## Pre-mixed Semax and Selank: reading the pharmacy label Most Semax and Selank calculators assume a 5 mg or 10 mg freeze-dried vial of one peptide mixed with 2 mL of water. A compounding pharmacy prescription usually arrives as a liquid, one vial per peptide, each labeled with its own concentration in mg/mL or mcg/mL. A label of 1,000 mcg/mL is the same as 1 mg/mL. Divide your prescribed dose in mg by that label concentration to get mL, then multiply by 100 for units: 150 mcg (0.15 mg) from a 1 mg/mL vial is 0.15 mL, or 15 units. Do the same for the second vial with its own label and its own prescribed dose; the two numbers are usually different. Switch the calculator above to Pre-mixed vial and type the label strength. Keep the two vials apart in your head as well as in the fridge. Semax and Selank are often prescribed together but they are different peptides with different label strengths, and drawing one with the other's units is the most common mistake on this pair. Worked example (pre-mixed vial) ``` label: 1 mg/mL prescription: 150 mcg (0.15 mg) 0.15 mg ÷ 1 mg/mL = 0.15 mL 0.15 mL × 100 = 15 units ``` Tired of reconstituting? Semax / Selank prescribed through Peptides.build arrives already reconstituted by a licensed US 503A pharmacy, labeled with the concentration and ready to draw. Your provider tells you how many units. [See the Semax / Selank protocol and pricing →](https://peptides.build/protocols/semax-selank/) Reconstitution ## How much BAC water for 5 mg or 10 mg of Semax / Selank Use the volume your pharmacy or prescriber specifies. The water changes only the concentration, never the amount of Semax / Selank in the vial: more water means more units for the same dose. 5 mg vial | Water | mg/mL | mcg per unit | | --- | --- | --- | | 1 mL | 5 | 50 | | 2 mL | 2.5 | 25 | | 2.5 mL | 2 | 20 | | 5 mL | 1 | 10 | 10 mg vial | Water | mg/mL | mcg per unit | | --- | --- | --- | | 1 mL | 10 | 100 | | 2 mL | 5 | 50 | | 3 mL | 3.33 | 33.3 | | 5 mL | 2 | 20 | Reading the syringe ## When Semax or Selank units fall between syringe lines Doses for this pair are small, so concentrated vials give short draws: 150 mcg from a 10 mg vial mixed with 2 mL (5 mg/mL) is 3 units, and from the same vial mixed with 1 mL it is 1.5 units, which the calculator flags as hard to measure. More water for the same vial makes the draw longer and easier to read. A 0.3 mL syringe is marked every unit (some every half unit) and is the usual fit for draws under 30 units. If the result is under 2 units, or is larger than your syringe holds, ask your pharmacist or prescriber whether a different concentration fits your dose; do not change the amount of water or the dose on your own. New to syringe units? The [general peptide calculator](https://peptides.build/tools/peptide-calculator/) has a units-to-mL table and a side-by-side of 0.3, 0.5 and 1 mL syringes. Common questions ## Semax / Selank calculator FAQ ### How many units of Semax or Selank do I draw? Units = dose (mg) ÷ concentration (mg/mL) × 100. For a 5 mg vial mixed with 2 mL (2.5 mg/mL), a prescription of 150 mcg is 0.06 mL, or 6 units on a U-100 syringe. Run the calculation separately for each peptide; the dose itself comes from your prescription. ### Do Semax and Selank come in one vial? Usually not. They are prescribed as two separate vials, each with its own strength and its own dose, so you calculate twice. Ask your pharmacist before combining two vials in one syringe. If a pharmacy does supply a combined vial, its label prints a concentration for each peptide; use the one your dose is written for. ### How much bacteriostatic water do I add to 5 mg of Semax or Selank? Use the volume your pharmacy or prescriber specifies. The water does not change the amount of peptide, only the concentration: 1 mL makes 5 mg/mL (50 mcg per unit), 2 mL makes 2.5 mg/mL (25 mcg per unit) and 5 mL makes 1 mg/mL (10 mcg per unit). Peptides.build prescriptions arrive pre-mixed, so patients never add water. ### My Semax or Selank vial came pre-mixed. How do I convert my dose to units? Read the concentration on the pharmacy label, for example 1 mg/mL (1,000 mcg/mL). Divide your prescribed dose in mg by it to get mL, then multiply by 100: 0.15 mg ÷ 1 mg/mL = 0.15 mL = 15 units. Choose Pre-mixed vial in the calculator to do this automatically. ### Does this calculator work for Semax or Selank nasal spray? No. Nasal sprays are dosed by the number of sprays or drops, and the amount per spray is printed on the bottle. This page is for injectable vials measured in U-100 syringe units. If your prescription is a nasal spray, follow the pharmacy label and your provider's instructions. ### Is the math different for N-Acetyl Semax or Selank amidate? No. N-Acetyl Semax, N-Acetyl Semax Amidate and Selank amidate are modified forms with their own schedules, but converting a prescribed dose into units uses the same formula. Make sure the vial label names the same form as your prescription before you calculate. ### How should Semax and Selank be stored once mixed? Follow the storage line on each pharmacy label. Reconstituted peptides are typically kept refrigerated, not frozen, and used before the beyond-use date. Do not use a vial that looks cloudy or has particles; contact the pharmacy. ### Are Semax and Selank FDA-approved? No. Neither Semax nor Selank is FDA-approved for any use in the United States, although both are approved medicines in Russia, and compounded medications are not FDA-approved. When they are prescribed here, a licensed provider decides whether they are appropriate for the individual patient. ### Are Semax and Selank allowed in competitive sport? Neither is named on the World Anti-Doping Agency Prohibited List. Drug-tested athletes should still check with their governing body, since anti-doping rules change yearly and some federations keep their own lists. ### Does this calculator tell me how much Semax or Selank to take? No. It performs arithmetic only and does not recommend a dose or schedule. The dose, timing and vial strength come from your prescription and pharmacy label. Prescribed, not mixed at home ## Get Semax / Selank already reconstituted A licensed US provider reviews a short online intake and sets your dose. A US 503A pharmacy prepares it, labels the concentration and ships it cold-chain, ready to draw. This calculator performs arithmetic only. It does not recommend doses and is not medical advice. Semax / Selank is not FDA-approved, and compounded medications are not FDA-approved. Always follow the dose, concentration and schedule on your prescription and pharmacy label, and confirm any calculation with your pharmacist or prescriber before injecting.