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Their, R., Golka, K., Bruning, T., Ko, Y
Subcutaneous B12 administration, although promising in select cases such as congenital cobalamin disorders, lacks comprehensive comparative studies against IM and oral routes
500mcg/day)
But these levels naturally decline with age and drop even further in response to chronic stress, inadequate sleep, poor dietary protein intake, heavy alcohol use, and prolonged exposure to environmental pollutants
The vitamin can be stored in the liver for a long time, so it may take a few years for a deficiency to develop
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