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It happens because the body cannot make enough healthy red blood cells to carry oxygen to your tissues, so your cells struggle to function efficiently
Improved Mood and Concentration Cognitive functions, including mood and concentration, can be influenced by the levels of vitamin B12 in the body
The specific reasons identified include intensive insulin therapy, decreased renal function, severe liver disease, alcohol ingestion, defective counter regulatory hormone release, missing meals/fasting, and gastroparesis
National Institutes of Health
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