The injection Hydroxocobalamin is given as an intramuscular injection (into a muscle), typically by a trained healthcare professional
Methylcobalamin may be better for those with impaired kidney function
B12 from food and supplements has to pass through a fairly involved process in the stomach and gut before your body can use it, and that process becomes less efficient with age, with certain medications, and with diets that include little or no animal protein
ARE THERE ANY RISK FACTORS FOR DEVELOPING A B12 DEFICIENCY
investigational only, not approved
Now, compare that to children from other places: Although American teenagers have similar normal B12 levels in females and males to Turkish teenagers in Konya, B12 levels swing wildly across other countries