what is the best way to give a b12 injection Vitamin Dosage Best Vitamin B12 Injection Site:

Genetic variations in CYP 2C9 (e.g., slow metabolizers) may affect phenytoin levels

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B-Complex Vitamins B vitamins help convert food into usable energy while supporting normal nervous system function

Signs and symptoms include (but are not limited to): You may be at risk of vitamin B12 deficiency if you fall into any of the aforementioned categories

Probably easier to just follow my supplement recommendations instead, which have also changed: at least 50 micrograms of cyanocobalamin once a day or 2000 micrograms of cyanocobalamin once a week