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Vitamin B12 deficiency can cause fatigue, weakness, anemia, and dizziness

B12 is an essential nutrient, and its deficiency is common, especially among individuals following restricted diets like vegetarianism or veganism, pregnant or breastfeeding women, older adults, those who have undergone gastrointestinal surgery or have gastrointestinal disorders, and people with an autoimmune condition known as pernicious anaemia

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Often within a few days, especially if you were running low to begin with

The b12 deteriorates when exposed to light

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