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It can be intermittent at first, often noticed on waking
In these cases, B12 injections can bypass the digestive system and deliver the vitamin directly into the bloodstream
The deficiency can arise due to improper diet or the inability to absorb the vitamin through natural means
For researchers new to sourcing and classification standards more broadly, our peptide sciences research guide covers the fundamentals
(The Cochrane Collaboration) (July 21, 2003)
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