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Produced via solid-phase peptide synthesis
This is vastly more dilute than topical formulations, but isolated cells in culture have direct peptide access without any barrier to penetration
A doctor may prescribe Vitamin B12 injections to treat anaemia or the deficiency of vitamin B12 in a persons body
People with Crohns disease or celiac disease might not absorb B12 well
This can lead to permanent and severe neurological issues
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