bac water quality guidelines Bacteriostatic 101: Comprehensive Guide to Its Uses and Storage – SyringesNeedlesDepot Water Quality Standards Guide -
Description
Here are the specifics

Route: Intramuscular injection (into a muscle, such as the gluteus or deltoid) is the most frequent route for this therapy, as it allows the vitamins to be absorbed over time from the muscle depot

Homocysteine concentrations in adults with trisomy 21: Effect of B vitamins and genetic polymorphisms

Tilting the head too far back causes the same problem
For a deeper comparison, see Peptide Mind's bacteriostatic water guide
