Feeling unusually tired, forgetful, or mentally foggy? It may not be normal aging. Researchers say a deficiency in vitamin B12, an essential nutrient required in tiny amounts, can significantly affect energy levels and brain function. New evidence suggests that vitamin B12 also helps maintain healthy mitochondria—the tiny powerhouses that produce energy inside our cells. When B12 levels are low, mitochondrial function may decline, leading to fatigue and cognitive symptoms even before classic signs of deficiency appear. Although vitamin B12 deficiency is treatable, experts recommend proper testing and medical guidance rather than self-diagnosing. Recognizing the warning signs early can help protect long-term health and well-being.
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