For decades, patients told they were low on vitamin B12 have walked out of the doctor's office with a shot in the arm. Wellness clinics now sell the same jab as an energy booster. A systematic review ...

There’s not much research on B12 shots for weight loss. People with obesity tend to have lower vitamin B12 levels, but it’s unclear if B12 shots can promote weight loss. If you have a deficiency, B12 ...

Dear Dr. Roach: I am 71 years old and was diagnosed with pernicious anemia in October 2024. My B12 and folate levels were low. My antiparietal antibodies were abnormal, but the intrinsic factor ...