Insulin syringes are measured in “Units” (UI) rather than standard milliliters (ml). On a standard U-100 syringe, 100 Units equals exactly 1 milliliter (1ml). If you have a smaller 0.5ml syringe, it holds 50 Units. Our calculator gives your final draw volume in Units so you know exactly which tick mark to pull the plunger to.

Peptide vials are sold by weight in milligrams (mg), but research dosages are much smaller and measured in micrograms (mcg). There are 1,000 micrograms in 1 milligram. For example, a 5mg vial contains exactly 5,000mcg of peptide. The calculator handles this conversion for you automatically.

The amount of water you add does not change the total amount of peptide inside the vial; it only changes the concentration of the liquid. Adding 1ml to 2ml of water is standard practice for most vials. If you are trying to measure a very small microgram dose, adding more water (e.g., 2ml or 3ml) dilutes the mixture further, making it easier to measure on the syringe.

You should always use Bacteriostatic Water. Unlike plain sterile water, Bacteriostatic Water contains 0.9% benzyl alcohol, which prevents bacterial growth and safely extends the refrigerated shelf life of your peptide after it has been mixed.

Peptide bonds are fragile. Shaking the vial vigorously to mix the powder and water can damage the molecular structure of the peptide. Always roll or swirl the vial gently between your fingers until the lyophilized powder is completely dissolved and the liquid is clear.