Mixing BAC... how much?

The homemade BAC water approach using pharmaceutical-grade benzyl alcohol and USP sterile water is technically sound if the final concentration lands at 0.9% - the filling step is where contamination risk is highest, and clean technique when piercing seals is essential. Most people find purchasing pharmaceutical-grade BAC water more practical than mixing their own.
 
sterile water works fine if BAC isn't available - the tradeoff is that working stock reconstituted in sterile water needs to be used faster, since there's no bacteriostatic preservation. for short-term use or if you're going through vials quickly that window isn't a problem. the DIY BA addition approach is something people do but the concentration needs to be right to actually be effective
 
2ml in a 10mg vial is the standard starting point for most reconstitution - it gives you a 5mg/ml concentration that makes the math easy. 1ml works if you're using tiny doses and want more precise small measurements, but 2ml is more forgiving if you're dosing in the typical range. You gotta decide which calculation you'd rather be doing every injection.
 
the transfer-and-dilute approach after initial reconstitution is useful when working with higher concentration formulations - moving to a larger vial and adding more carrier fluid after reconstituting lets you pull smaller, more precise volume doses without having to work with tiny fractions on the syringe. the filter step during transfer is the important one for removing any particulate from the initial reconstitution
 
Starting at 2mg is the standard conservative approach for first-time reconstitution. The 5mg vial question usually comes down to flexibility - smaller vials give you more control over concentration until you know how you respond. BAC water volume to vial size is the ratio to nail down early. What concentration are you planning to work with?
 
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