Other reported effects include: Headaches and dizziness Nausea and gastrointestinal discomfort Allergic reactions to B12 formulations (rare) If you experience symptoms suggesting a severe allergic reaction (difficulty breathing, severe rash, swelling of face/throat), seek emergency medical attention immediately by calling 999 or attending A&E
Discontinuing at the first sign of shedding may prevent the regrowth that would have followed
Delayed Treatment: Vitamin B12 deficiency left untreated for longer than 3 months may cause permanent spinal cord and nerve damage
B12 injections are generally very well tolerated
In addition to reducing or eliminating the symptoms of B12 deficiency, research suggests that B12 shots may: Reduce stress (7) Support central nervous system function, red blood cell formation, and DNA synthesis (2) Reduce the risk of vision loss from age-related macular degeneration (8) Lower homocysteine levels, which is associated with cardiovascular disease and stroke (9, 10)