First, the effect is enzymatic and cumulative you are shifting a metabolic set-point over days and weeks, not triggering an acute hormonal event, which is why steady daily exposure matters more than any single large dose
What if my pharmacy did not put a BUD on the label
By definition, bacteriostatic water, also known as Bac water, is a combination of sterile water incorporated with a bacteriostatic preservative, according to the standards set by the United States Pharmacopoeia (USP), to maintain its sterility and non-pyrogenicity upon repeated dosing
For BPC-157 specifically, bacteriostatic water is the standard choice
Surveying the literature, Burridge and Linden found that only Mpemba and Osborne, in their classic study, saw a Mpemba effect too pronounced to attribute to this kind of measurement error