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This can happen if you suffer from various gastrointestinal issues including celiac disease, Crohns disease, cancer, damage to your digestive tract, or an infection

Annals of Clinical & Laboratory Science, 45(4), 426-432

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She told me that I will get better but that it will take time (possibly months)

Para el tratamiento inicial de la deficiencia de vitamina B12, la dosis habitual es de 100 mcg SC/MC, administrada cada da durante 10-15 das, seguida del tratamiento de mantenimiento