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Symptoms typically peak during the first week and then gradually diminish
A recent review mentions the importance of focusing on things like getting enough protein, staying hydrated, and taking vitamin D
Individuals interested in supporting immune health and healthy aging
However, a very small percentage of B12 from a supplemental dose is absorbed by passive diffusion, rather than by intrinsic factor, such that vegans can make up for taking B12 only once per day, or even only once per week, by taking larger doses than normally provided by food
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