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5 side effects of excessive intake of vitamin B12 Vitamin B12 deficiency is widespread in India and often goes undiagnosed despite its effects on long term neurological, cognitive, and physical health. Experts say its subtle symptoms: persistent fatigue, numbness, or poor concentration Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project Vitamin B12 Injection Side Effects and Safety
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