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Its very helpful for people who have trouble absorbing B12 because of their diet or health issues
you have numbness, pins and needles, balance problems, walking difficulty, memory or concentration changes, or vision problems
A mouse metabolises on a faster clock than a human, and a controlled diet in a cage is not a free-living human diet so even the week-numbers above should be read as the shape of a gradual response, not a promise that a human would see anything on the same calendar
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