How much water should I add to a vial?

There is no single right amount. The amount of water sets how strong the mix is. More water spreads the same peptide through more liquid, which can make small amounts easier to measure. The mixing calculator at /calculator does the math from the vial strength, the water you add, and your target amount. It is a math tool and does not recommend a dose. BPC-157 prefills: /calculator/bpc-157.

The whole guide to mixing peptides, step by step, in the order problems come up

Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.

Part of reconstitution (mixing). How lyophilized powder is turned into a solution.