difference between b12 injections and pills Are Vitamin Shots Right for You? B12 Injections vs. Oral Supplements:
Description
Facts Claims that cyanocobalamin is toxic because of its cyanide molecule ignore context and dosage

Heffernan MA, et al
Vitamin B12 injections are clinically indicated for specific patient groups with documented deficiency or malabsorption conditions, rather than as a general energy supplement

A vegetarian diet which contains no animal products (including milk products or eggs) does not supply any vitamin B 12
