Although cyanocobalamin is more readily absorbed, much of it is excreted through the urine before it can reach the cells Cyanocobalamin vs Hydroxocobalamin In comparison to hydroxocobalamin, cyanocobalamin has a significantly worse absorption rate and storability, which is why today mostly hydroxocobalamin is used in B12 injections
References Maier, C., Hartung, N., de Wiljes, J., Kloft, C., & Huisinga, W
PloS one 9, e97774 (2014)
You can try to use your primary care physician as long as you use the recommended settings above but beware: Most physicians are not used to dosing vitamins and are very unfamiliar with them in general
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