What is the difference between a U-100 and U-40 syringe?

A U-100 syringe holds 100 units per mL (1 unit = 0.01 mL); a U-40 holds 40 units per mL (1 unit = 0.025 mL). The same volume reads a different number of units on each, so always match the calculator to your syringe.

Is there a U-50 syringe?

No. A "50-unit syringe" is simply a 0.5 mL U-100 syringe — it holds 50 units. There is no U-50 insulin concentration.

How much bacteriostatic water should I add?

Any amount works mathematically; more water means a larger, easier-to-measure draw but a more dilute solution. Use the reverse-solve mode to find the BAC water that lands your dose on a round number of units.

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Free Epitalon Reconstitution Calculator

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Reconstitute Epitalon accurately. The calculator below is pre-loaded with a typical Epitalon starting point — adjust vial strength, bacteriostatic water and your target dose to read the exact volume and U-100/U-40 syringe units to draw. For research use only.

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Peptide preset Vial amount

Bacteriostatic water (mL) Target to draw

Desired dose Unit IU

Syringe type Barrel size

Doses per day

Draw to

units

Concentration: /mL
Dose: mg ( mcg) IU
Add BAC water: mL
Doses per vial
Lasts ~: days

/ on a syringe

How to mix Epitalon with bacteriostatic water

Swab the rubber stopper of both the Epitalon vial and your bacteriostatic water vial with an alcohol wipe and let them dry.
Draw your chosen amount of bacteriostatic water into the syringe (use the calculator above to pick a volume that lands your dose on round units).
Inject the water slowly down the inside glass wall of the Epitalon vial — aim the stream at the glass, never directly onto the powder.
Gently swirl or roll the vial until the solution is completely clear. Do not shake.
Store the reconstituted Epitalon refrigerated, then use the calculator and chart above to read the exact mL and syringe units to draw.

Frequently asked questions

What is the difference between a U-100 and U-40 syringe?: A U-100 syringe holds 100 units per mL (1 unit = 0.01 mL); a U-40 holds 40 units per mL (1 unit = 0.025 mL). The same volume reads a different number of units on each, so always match the calculator to your syringe.
Is there a U-50 syringe?: No. A "50-unit syringe" is simply a 0.5 mL U-100 syringe — it holds 50 units. There is no U-50 insulin concentration.
How much bacteriostatic water should I add?: Any amount works mathematically; more water means a larger, easier-to-measure draw but a more dilute solution. Use the reverse-solve mode to find the BAC water that lands your dose on a round number of units.

For research use only. Verify all calculations against current literature and use sterile technique.