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Vitamin B12 is crucial for blood cell formation, nerve health, and DNA synthesis. Deficiency can cause fatigue, weakness, and neurological issues. Rich sources include animal products, fortified plant-based foods, and supplements. Proper absorption requires good stomach acid levels, key nutrient pairings (calcium, folate, B6), and a healthy gut. Excess alcohol and long-term antacid use can hinder absorption. Those at risk, such as vegans and older adults, may need B12 supplements or injections for optimal health.
