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Both scenarios are valid depending on the underlying health context
This is because B12 helps to regulate the production of melatonin, the hormone that regulates the sleep-wake cycle
The B12-IF complex is absorbed by cells in the final section of the small intestine (the ileum), where IF is cleaved from B12 and subsequently, B12 passes into the blood where transport proteins bind to it and is distributed to cells all around the body (Obeid et al., 2015
You'll use it for visits where the clinical picture is simple: one minor problem, minimal data to review, and low risk
The frequency of administration may decrease over time as well once the vitamin has been able to build up a bit in the body
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