A deficiency can occur for several reasons, such as pernicious anemia (a condition where the body cannot absorb vitamin B12 from the diet), certain medical conditions (e.g., Crohn's disease, celiac disease), surgical removal of part of the stomach or intestine, or strict vegetarian/vegan diets if not adequately supplemented
How frequently you need to receive B12 shots depends on the medical conditions you suffer from due to vitamin B12 deficiency
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Dont forget to include foods that dont come with a nutrition label, like dark leafy greens, and keep an eye on serving sizes to make sure youre not overdosing on added vitamins or minerals.
Am J Clin Nutr 2021;113(4):821831
Keeping the product in a dark place can help preserve its quality