Pindrop

Peptide Reconstitution Calculator

Enter your vial size, how much bacteriostatic water you mixed in, and your dose. You get the exact number of units to pull on a U-100 insulin syringe.

mg

Total peptide in the vial, from the label.

mL

How much you drew into the vial.

mcg

Syringe

Draw on the syringe

10units

0.1 mL at 2,500 mcg/mL
01020304050
Concentration
2,500mcg/mL
Doses per vial
20
Volume
0.1mL

What this calculator does

Reconstitution turns a dry peptide into a liquid you can measure. Once you add bacteriostatic water to the vial, the peptide is spread evenly through that liquid at a fixed concentration. This tool works out that concentration, then tells you what fraction of a milliliter carries your dose, and converts it to the units printed on an insulin syringe.

The three inputs are the peptide amount in the vial, the water you mixed in, and the dose you want per shot. More water means a weaker solution, so you draw more units for the same dose. Less water means a stronger solution and a smaller draw. The dose can be entered in micrograms, milligrams, or IU, and the vial unit follows it so the two always match.

Reading the result

The big number is where to stop on the plunger, counting the ticks on a U-100 syringe where 100 units equals 1 mL. We also show the exact volume, the solution concentration, and how many doses the vial holds. Warnings appear when a dose is larger than the vial contains, when the draw is too big for the syringe you picked, or when it is under one unit and hard to measure. The math is exact; the printed dose on your protocol is the number to trust.

Common questions

How much bacteriostatic water should I add to a peptide vial?
There is no single correct amount. More water makes a weaker solution and a larger draw; less water makes a stronger solution and a smaller draw. Pick a volume that puts your dose on an easy-to-read number of units. 1, 2, and 3 mL are common. Enter your vial size and dose and try a couple of water volumes to see which reads cleanest.
What is the difference between bacteriostatic and sterile water?
Bacteriostatic water contains 0.9% benzyl alcohol, which stops bacteria from growing, so a vial stays usable for weeks in the fridge. Sterile water has no preservative and is meant for a single use. For a multi-dose peptide vial you draw from over time, bacteriostatic water is the standard choice.
How do I convert my dose from mcg to mg?
1 mg equals 1000 mcg. So a 250 mcg dose is 0.25 mg, and a 5 mg vial holds 5000 mcg. You do not have to do this by hand — pick the unit your dose is written in and the calculator converts it.
How many units should I draw on the syringe?
That is the main number this calculator gives you. On a U-100 insulin syringe, 100 units equals 1 mL, so the units are just your dose volume measured on that scale. Draw to the tick shown.
What if my dose lands on a fraction of a unit?
A draw like 12.5 units is fine; insulin syringes are marked finely enough to hit it. If you get awkward numbers every time, change the water volume — a different concentration can move your dose onto a rounder unit count. The bacteriostatic water calculator works this out in reverse.
How long does a reconstituted peptide last?
Most peptides keep for about 2 to 4 weeks refrigerated once mixed, though it varies by compound. Keep it cold, protect it from light, and do not use it if the solution turns cloudy. The medication storage calculator gives per-compound windows.

Pindrop is a calculation tool, not medical advice. Confirm your dose and protocol with a licensed healthcare provider.