Laboratory tool
Reconstitution calculator
Select a catalog material, set diluent, then a target mass. Optional: enter a mass already drawn and recalculate the extra volume.
Vial
The dry mass on the label. This number is fixed — diluent volume never changes what's sealed in the vial.
The only variable you're choosing. More diluent spreads the same mg thinner — it lowers concentration, not vial content.
Same vial
Any mass figure — this converts it to a volume, it doesn't suggest one.
If part of the vial was already used, the syringe shows only what's left to draw toward your target.
—
U-100 · 1 mL
Shown: full draw
Result
2.5 mg/mL
2,500 mcg/mL
Enter a target mass to see the draw.
View AOD-9604 5mgArithmetic only. Not a protocol and not a recommended quantity. Laboratory research use only — not for human or animal use. U-100 = 100 units / 1 mL. U-50 = 50 units / 0.5 mL (same 0.01 mL per unit).
Understanding the water
Why the same vial can read three different numbers
Most confusion isn't about the compound — it's about what bacteriostatic water is doing, and why changing its volume changes the concentration without changing what's in the vial. Three fixed facts:
01
Dry mass, sealed
The vial holds a fixed number of milligrams of lyophilized (freeze-dried) peptide. This figure never moves — it's a property of the vial, not of anything done to it.
02
Diluent added
Bacteriostatic water adds volume, and 0.9% benzyl alcohol to inhibit bacterial growth between draws — it doesn't add or remove any peptide mass.
03
Concentration set
Swirl gently, don't shake — shaking can denature the peptide. The mass is now distributed evenly through the liquid: mg ÷ mL, fixed until the vial is gone.
40 units
U-100 · 1 mL
Reading the barrel
A "U-100" mark is not a milliliter
Insulin-style syringes are printed in units, not milliliters. Both the U-100 and U-50 barrel shown here use the exact same conversion — 0.01 mL per unit. What differs is capacity: U-100 goes up to 100 units (1 mL total), U-50 goes up to 50 units (0.5 mL total) — a smaller barrel with finer graduations for small draws, not a different scale.
The calculator above converts a target mass into a volume, then into whichever barrel is selected — three numbers describing the exact same physical draw.