We are often asked – How Much BAC Water for 500mg NAD+ – and 5 mL of bacteriostatic water is the most common starting point for a 500 mg NAD+ vial, because it creates a 100 mg/mL solution. That said, it’s only one of several common dilution choices, and the right volume depends on how precise you need the dose to be, how much injection volume you want to handle, and what your clinician recommends.