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Description
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)

doi: 10.1093/nutrit/nuac096, 3

Once unfolded, it does not refold correctly

Yes, if youre trained and guided, you can give yourself shots

Excessive alcohol consumption and other health problems can also result in B12 deficiencies
