A property comparison of the two diluents researchers most often record against lyophilized vials — not a recommendation for any product.
Bacteriostatic water
Sterile water plus a small amount of benzyl alcohol as a preservative.
Commonly recorded for multi-draw vials that will be kept refrigerated and sampled more than once.
The preservative slows bacterial growth relative to unpreserved water. It does not make the vial sterile indefinitely.
Unpreserved
Sterile water with no preservative. Same solvent, shorter practical handling window once opened.
Commonly recorded when a product label calls for single-use, fresh-prep, or a short post-mix window.
Without a preservative, unused solution is typically discarded on a shorter clock than a BAC-water vial — follow the label.
Opens with a 5 mg vial and 250 mcg target already filled in.
Recorded storage windows after mixing — independent of which diluent was used. Filter by name. Full notes live on the shelf life guide.
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Diluent choice is a label / COA / protocol decision. PepRally does not assign a diluent to a peptide. The cards above describe how the two liquids differ so a reconstitution record can be kept consistently. The table below is reconstituted-storage windows from the curated library — handling time after mixing, not which water to use.
Once a volume is chosen, the reconstitution chart and reconstitution calculator turn vial mg and that volume into concentration and syringe units.
Calculators and tables that sit next to this one — mix math, syringe units, diluent notes, and storage windows.
Educational and organizational tool only — not medical advice, dosing guidance, or a substitute for professional judgment. For research purposes only.