Peptide reconstitution calculator
Pick your vial, water and dose. The syringe shows exactly where to draw to, and you can drag the plunger to try other doses.
Your vial
Amount in the vial, typical N-Acetyl Epitalon sizes
Bacteriostatic water
How much you add to the vial
More water makes each dose a bigger, easier-to-read volume. It does not change how much peptide you get.
Dose
How much peptide you want each time
Syringe
U-100 insulin syringe, 100 units per ml
Picked for you: the smallest size that holds this dose, because its lines are easiest to read. Tap the size you have if it is different.
To get 250 mcg, draw to
10units
0.1 ml on a 0.3 ml syringe
- Strength
- 2.5 mg/ml
- Each unit holds
- 25 mcg
- Doses per vial
- 20
Other doses from this vial, in mcg
For research planning only. Double-check every calculation before use.
How the maths works
Dissolving a freeze-dried peptide in bacteriostatic water gives a solution of known strength. Three steps turn that into a mark on the syringe.
- 1
Strength = peptide in the vial ÷ water added
Example: 10 mg ÷ 2 ml = 5 mg/ml
- 2
Volume = dose ÷ strength
Example: 0.25 mg ÷ 5 mg/ml = 0.05 ml
- 3
Units = volume × 100
Example: 0.05 ml × 100 = 5 units
More water means larger, easier-to-measure volumes per dose; less water means smaller ones. The amount of peptide per dose is the same either way.
Common questions
How much bacteriostatic water should I add?
There is no single right amount. The water only changes the volume each dose takes up, not the amount of peptide in it. Pick a volume that puts your usual dose comfortably on the syringe scale: more water for small doses, less water for large ones.
What is a unit on an insulin syringe?
Insulin syringes sold in the UK are U-100: 100 units fill 1 ml, so one unit is 0.01 ml. The 0.3 ml, 0.5 ml and 1 ml sizes hold 30, 50 and 100 units.
Which syringe size should I use?
The smallest one that holds the whole dose. A smaller barrel spreads the same volume over more length, so the lines are further apart and easier to read. The calculator marks that size as the best fit.
How do I read the syringe?
Read the line level with the front edge of the black rubber stopper, the edge nearest the needle. Ignore the cone at the tip and any air bubble.
Can I use it for peptides measured in IU?
Yes. Switch the vial to IU and enter the dose in IU; the maths is the same. Pick a peptide such as HGH and the calculator switches for you.