How Much Bacteriostatic Water Should You Use?

PeptideTally Team

One of the most common newcomer questions: how much bacteriostatic water to add when reconstituting.

There's no single "correct" amount — it's a trade-off:

- **More water** = lower concentration = easier to measure small doses precisely on the syringe - **Less water** = higher concentration = fewer units to draw, but harder to measure small amounts accurately

Most researchers use between 1 mL and 3 mL depending on vial size and target measurement precision. Our [peptide calculator](/peptide-calculator) lets you model any combination and shows the exact syringe units.

What ratios do you find easiest to work with for measurement accuracy?