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It needs to be broken down, mixed with stomach acids, bind with intrinsic factor, and then be absorbed in the small intestine
2015, pp
PRECAUTIONS: Vitamin B12 deficiency that is allowed to progress for longer than 3 months may produce permanent degenerative lesions of the spinal cord
Administration via injection is the most effective way to get the vitamin into your body and work as soon as possible, allowing you to experience the benefits in a matter of days
doi: 10.1159/000053183
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