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However, other circumstances can also be responsible, such as viral pneumonia, sepsis, chest injuries, burns, blood transfusions, aspiration of gastric contents, pancreatitis, intravenous drug use, abdominal trauma, and acute radiation syndrome [165,166,167]

PMID: 18066546 6

The benefits typically last 1 to 2 weeks

and (c) the olfactory nerve pathway where the drug is taken up into the neurons by endocytotic or pinocytotic mechanisms and transported by intracellular axonal transport to the olfactory bulb [2,16]

Vitamin B12 deficiency typically has two causes: because a person isn't eating enough foods containing it or malabsorption because of conditions like celiac disease and pernicious anemia