About research supplies
Lyophilised peptides are supplied as a dry powder and have to be reconstituted before any analytical work. That requires a diluent, and the choice of diluent affects how long the prepared solution remains usable.
Bacteriostatic water is sterile water with a small amount of benzyl alcohol added as a preservative. The preservative is what allows a vial to be entered more than once without the shelf life collapsing, which is why it is the standard choice for multi-use research handling over plain sterile water.
The arithmetic that follows is a single division: concentration equals the mass in the vial divided by the volume of diluent added. The peptide calculator runs it, and the reconstitution ratios article covers what the numbers mean and where the labelled milligram figure and the actual peptide content can differ.
All compounds listed are supplied for in vitro laboratory and educational research only. They are not listed on the Australian Register of Therapeutic Goods (ARTG) and are not for human or animal consumption.