Tools
Peptide reconstitution calculator
Vial size, water volume and dose in; concentration, draw volume and syringe units out. It is arithmetic about a container, and only that.
What this does and does not do
Vial, water, dose
- Concentration
- 2,500 mcg/mLHow much peptide is in each millilitre of the mixed solution.
- Draw per dose
- 0.1 mLThe volume of solution that holds one dose.
- On a U-100 insulin syringe
- 10 unitsThe same volume read on the syringe’s scale: 100 units is 1 mL.
- Doses per vial
- 20How many doses of this size the vial holds.
What these numbers mean
Concentration is how much peptide ends up in each millilitre once the powder is dissolved. A 5 mg vial mixed with 2 mL of water holds 5,000 micrograms in 2 millilitres, so every millilitre carries 2,500 mcg. Add more water and the concentration falls; every dose then needs a larger draw. Add less and the draw shrinks, which makes small doses harder to read on the syringe — the reason the calculator warns below 2 units.
Units are not millilitres. An insulin syringe is marked in units, and on the common U-100 syringe there are 100 units to a millilitre — so 10 units is 0.1 mL, whatever is in the vial. The unit marks are a way of reading a volume, and the volume that holds one dose depends entirely on the concentration you mixed. The syringe guide walks through the gradations.
Bacteriostatic water is sterile water with a small amount of benzyl alcohol, which keeps a vial from growing bacteria over the days or weeks it is used from. Sterile water without it is for single use; tap water is neither sterile nor preserved. What reconstitution is, and why the water goes in slowly down the side of the vial, is in the reconstitution guide.
None of this is a dose. The figures a reader might start from are on each compound's profile, each attributed to who reported it and at what evidence grade; the methodology page explains how those are checked.