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Vitamin B-12 is separated from the protein during digestion and is absorbed into the bloodstream
We are entirely dependent on dietary intake or supplementation, and even with adequate dietary intake, absorption can be impaired by a range of factors including age-related changes to stomach acid production, certain medications, and digestive conditions
The median intake was 976 ug in this study from 1991-2002 and 1000 ug in the 2003-2006 period [41]
It's probably still worth patch testing on a small area first, as with any new scalp product
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