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To absorb vitamin B12 effectively, your body requires an intact stomach and gut, a well-functioning pancreas, and sufficiently high levels of intrinsic factor, a protein that binds to vitamin B12 in the stomach (1)

This is the single biggest source of confusion around the name

Bruce Bistrian, chief of clinical nutrition at Harvard-affiliated Beth Israel Deaconess Medical Center

Short-Term : Improved focus, sleep, and reduced fatigue over a few days to a week Ongoing : With regular sessions (weekly or monthly, depending on your levels), B12 benefits accumulate, supporting mood, immune health, and cognitive function

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