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This is due to various factors, including poor diets, malabsorption of vitamins, and certain medical conditions and medications which can contribute to lower levels of vitamin B12 in the body
"Current Nanocarrier Strategies Improve Vitamin B12 Pharmacokinetics, Ameliorate Patients' Lives, and Reduce Costs"
Long-term deficiency can lead to cognitive problems
Life sciences , 54 5, PL63-8
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