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et al.: Vitamin B-12 status in infancy is positively associated with development and cognitive functioning 5 y later in Nepalese children (2017) The American Journal of Clinical Nutrition | DOI: 10.3945/ajcn.116.144931

Numerous foods contain B vitamins, and most people can get enough through a balanced diet that includes eggs, fish, meat, nuts, and dark leafy greens

In fact, animals get their B12 through eating B12-producing bacteria found in plants (the only real source of this essential nutrient), and due to the increasing depletion of our soils, B12 levels in animal products vary greatly

One important test is Ferritin, which measures the level of iron stored in the body