vitamin b12 injection sub q or im Best Site: Administering B12 Shots B12 Shots vs. IV Infusions:

Problem in the Recent American Heart Association Guideline on Secondary Stroke Prevention: B Vitamins to Lower Homocysteine Do Prevent Stroke

Guided Treatment: Helps tailor interventions, such as diet changes or B12 supplementation

This personalized approach to medication preparation allows for adjustments in concentration, volume, or other characteristics to meet specific patient needs, as determined by the prescribing physician, that may not be addressed by commercially available products

So, injections are a more direct way to make sure your body gets the B12 it needs, while tablets might not work as efficiently because they have to go through your stomach and intestines first