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. Vitamin B12: Overdose and Side Effects Business Insider B12 Shots: Vitamin B12 Injections Benefits, Uses, Risks Dr. Axe Can Vitamin B12 Deficiency Indicate Cancer? Know Warning Signs What are the Signs of B12 Deficiency
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