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B12 injections have no risk for overdose because excess vitamin B12 is just excreted in the urine

Common symptoms include: Persistent fatigue and weakness Pale or jaundiced skin Heart palpitations and shortness of breath Nerve problems such as numbness or tingling Cognitive disturbances such as memory loss Glossitis and mouth ulcers High homocysteine levels, leading to cardiovascular issues Given the severe symptoms associated with Vitamin B12 deficiency, timely and effective treatment becomes essential

Some people may need B12 supplementation due to certain conditions that inhibit absorption

Nicotinamide N-methyltransferase: more than a vitamin B3 clearance enzyme