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If you feel like you meet one of more of the criteria above, checking your B12 levels may provide some answers

Vitamin B12 is one of those vitamins that are only really naturally attained through diet, making anyone who has dietary restrictions or trouble absorbing vitamins through diet alone at risk of suffering from a deficiency

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Since vitamin B 12 is found predominantly in foods of animal origin, strict vegetarian and vegan diets can result in vitamin B 12 deficiency (2, 16)