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Journal of Endocrinology , 152(3), 457462
This happens often during your period, when you're pregnant, or when you're going through menopause
This is often due to limited dietary intake, malabsorption, medical conditions, or the use of B12-depleting medications ( Vitamin B12 deficiency is determined as follows ( Because the ability to absorb B12 from food declines with age, deficiency is more common in older adults
2014;307:C195207
However, levels reduce due to stress, aging, and environmental exposure
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