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Glycine is frequently combined with methylcobalamin or L-carnitine because it enhances the absorption and effectiveness of these compounds
Family physicians should consider screening patients who have any risk factors listed in Table 1
"Comparative Bioavailability and Utilization of Particular Forms of B12 Supplements With Potential to Mitigate B12-related Genetic Polymorphisms", Integrative Medicine: A Clinician's Journal (Encinitas)
DOI: 10.1210/jc.2015-3754
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