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 NAD+ Reconstitution Calculator

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Reconstitute NAD+ accurately. The calculator below is pre-loaded with a typical NAD+ 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 NAD+ with bacteriostatic water

Swab the rubber stopper of both the NAD+ 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 NAD+ 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 NAD+ 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.