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While animal-based foods like meat, eggs, and dairy are rich in B12, plant-based diets can lack this nutrient, making supplementation a common choice for vegans, vegetarians, and those with certain health conditions

Deficiency during pregnancy can increase the risk of birth defects and complications

This usually settles within a day or two

Neurologic symptoms may take longer, but many people notice energy/mood improvements within days to weeks once deficiency is corrected

Common Everyday Causes and Nerve Entrapments Temporary compression Sleeping with the arm overhead, leaning on the elbow, or resting the wrist on a sharp desk edge can compress nerves