can b12 injection cause fever High Vitamin Levels: Causes, Symptoms, and How to Manage Them Symptoms of high vitamin B12

Some patients also experience mild diarrhea, swelling, or itching

Enhanced Fat Oxidation and Body Composition Improvement: The primary benefit documented in research is the enhancement of fat metabolism and reduction in body weight gain

PMID 35005595

If your vitamin B12 deficiency is not caused by a lack of vitamin B12 in your diet, youll usually need to have an injection of B12 (hydroxocobalamin) every 2 to 3 months for maintenance

This decreases production of intrinsic factor and secretion of hydrochloric acid in the stomach, two things that affect your body's absorption of B12

Specialized B12 or vitamin injection clinics