Why bacteriostatic water is the standard for peptide reconstitution In laboratory practice, the choice of solvent is governed by several requirements at once, and bacteriostatic water meets them all: Neutrality toward the peptide , it has a near-neutral pH and contains no salts or ions that could react with the peptide molecule or affect its stability Compatibility , it works with the vast majority of common research peptides without causing precipitation, aggregation, or degradation Extended solution shelf life , thanks to the preservative, the reconstituted solution lasts substantially longer with proper storage than with sterile water Safety of repeated withdrawal , a single vial serves for multiple withdrawals over days, which is essential when working with small doses Availability and standardization , it is an established, well-documented solvent familiar to everyone who works with peptides When something else is used For completeness, it should be added that bacteriostatic water is not the only possible solvent, merely the most common

Because gastric absorption rates are unpredictable compared to vitamin B12 injections, according to Foxx, most oral vitamin B12 supplements provide much more than the recommended amount to account for the discrepancy between the dose you take and benefit from (1)
Shelf Life for Opened, Sealed, Refrigerated and Mixed Vials BAC water is good for 28 days after opening and 2 to 3 years sealed
Treasure Island (FL): StatPearls Publishing
This means multiple studies came to the same conclusion: oral vitamin B12 is an adequate delivery system for vitamin B12