how you feel after b12 injection Vitamin Side Effects and Safety Oral Vitamin B12 Side Effects
Description
These are more considerations of medications affecting vitamin status (rather than the vitamin affecting the medication), but they illustrate the clinical judgment required when co-administering this injection with certain treatments

Energy tends to respond first, mood and focus follow within a week or so, and the longer-term, structural benefits build quietly over months
declares having received consulting honoraria from Amgen, AstraZeneca, Bayer, Boehringer Ingelheim, Daichii-Sankyo, esanum, Gilead, Ipsen, Eli Lilly, Novartis, Novo Nordisk, Sandoz and Sanofi
It offers a simple way to manage B12 needs and often works well to address deficiencies caused by diet