Sterile water for injection

Sterile water for injection is germ-free water with no additives at all. It can be used to reconstitute peptides (meaning to dissolve the powder into a usable liquid).

The key difference

Unlike BAC water (bacteriostatic water), it contains no benzyl alcohol (a preservative that stops microbes from growing) and therefore no protection against microbes. A solution mixed with it should be used promptly (ideally at once) or discarded, because repeated piercing could let microbes grow.

Wording mix-ups

Not the same as distilled water or saline - „sterile" means germ-free and injection-grade, not merely „clean".