Bacteriostatic water is a diluent (solvent), not a compound that is "dosed." It is used to reconstitute freeze-dried peptides. The volumes below are conceptual illustrations, not instructions for preparing or using any product. Follow the specific peptide's labeling and qualified guidance.
Overview
How it is used to reconstitute
Reconstitution means turning freeze-dried powder back into a solution:
- The water is added slowly against the vial wall to gently dissolve the powder without foaming.
- Common reconstitution volumes are on the order of 1–3 mL per vial, chosen to make the resulting concentration easy to measure — this is a convenience choice, not a fixed rule.
- The water does not change the amount of peptide present; it only determines how that fixed amount is spread across a volume.
Why the volume you choose matters
The key idea is an inverse relationship between diluent volume and concentration:
- A fixed amount of powder in more water gives a lower concentration (mg/mL).
- The same amount in less water gives a higher concentration.
A reconstitution calculator can help reason about these relationships without prescribing any real figure. The correct volume always comes from the specific peptide being prepared.
Storage and oversight
Because it contains a preservative for multiple entries, labels typically specify a discard window after first entry, and the reconstituted peptide may need refrigeration. Bacteriostatic water differs from plain sterile water and from products intended for other routes, so the specific peptide's labeling and professional guidance — not a generic page — govern how it is used.
For a broader overview, see the main bacteriostatic water reference page.