US$ 26.60
b12 injection 100 pets by henry schein Cyanocobalamin Injection, 1000 mcg/mL 1mL Vial Rx only Provides 5 00143961910 - Henry Schein Medical
Description
Jul 2017;31(4):193-203

Methylcobalamin Injections are also better absorbed by your tissues for use by your liver in carbohydrate metabolism and used by your brain to regulate melatonin, circadian rhythms, and sleep function

Regular injection for energy boost gives reliable, stable results

Anyone selling you a precise human bioavailability figure is guessing
Food and Drug Administration (e.g., fortified plant milks, cereals, and nutritional yeast), vitamin B12 does not appear to be associated with adverse health consequences or even minor side effects

Data-driven adjustments are key