Enter the vial size, the water you added and your target dose. The exact unit mark comes back drawn on a real syringe — every field updates the result as you type.
How much bacteriostatic water should I add to a peptide vial?
There's no single correct amount — the water sets the concentration, not the dose. More water gives a larger, easier-to-measure draw; less gives a smaller, more concentrated one. Common choices are 1, 2, or 3 mL — adjust until your draw lands on a convenient syringe mark.
How do I calculate a peptide dose in units?
Divide your dose by the solution's concentration to get the draw in mL, then multiply by 100 for units on a U-100 syringe. For example, 250 mcg from a 2.5 mg/mL solution is 0.1 mL, or 10 units.
What syringe size is best for peptides?
Match the barrel to your draw. A 30-unit (0.3 mL) syringe has the finest marks and suits small doses, 50-unit fits mid-range draws, and 100-unit fits the largest. All three share the same U-100 scale — only the precision differs.
How long does a reconstituted peptide vial last?
Once reconstituted, a peptide solution is less stable than the dry powder — keep it refrigerated and away from light. Reconstituted peptides are generally used within a few weeks, while unmixed powder stays stable much longer in cold storage.
Can I use sterile water instead of bacteriostatic water?
Sterile water has no preservative, so it's best for single use only. Bacteriostatic water contains 0.9% benzyl alcohol, which helps protect a multi-dose vial over its life. The math is the same either way.
How do I convert mcg to mL?
You can't convert mcg to mL without knowing the concentration — mcg measures mass, mL measures volume. Once reconstituted, divide the dose in mcg by the concentration in mcg/mL to get the volume drawn.