Vitamin B12: Symptoms, Dosage & Toxicity Risks Pernicious Anaemia: When Your Body Can't Absorb Vitamin B12 Properly Low B12 levels can lead to fatigue, numbness, irritability, and moreyet many people don't realize they're deficient. The good news? Testing and treatment are simple with options like injections or dissolvable tablets. How Quickly Does B12 Shot Work? Does It Help to Lose Weight?
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