B12 does not stack: once your blood level is in the normal range, extra B12 is simply passed out in your urine rather than converted into more energy
The injection would be given slowly into a vein, or added to an IV drip
Many insurance companies are now offering coverage for B12-vitamin Shots
First, a bacterial reverse mutation test (Ames test) assessed AOD9604s mutagenic potential using four histidine-dependent auxotrophic mutants of Salmonella typhimurium (TA1535, TA1537, TA98, TA100) and one tryptophan-dependent auxotrophic mutant of Escherichia coli (WP2 uvrA), using both plate incorporation and pre-incubation methods at doses of 0, 1.6, 8, 40, 200, 1,000, and 2,000 g AOD9604/plate
SHIRLEY, NY 11967 PACKAGE LABEL.PRINCIPAL DISPLAY PANEL - 1 mL Container NDC 0517-0031-25 CYANOCOBALAMIN INJECTION, USP 1000 mcg/mL 1 mL VIAL FOR IM OR SC USE ONLY Rx Only AMERICAN REGENT, INC