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Many people have trouble with nutrient absorptionfrom supplements or fooddue to the presence of intestinal inflammation, poor gut health, or a deficiency of intrinsic factorsglycoprotein produced in the stomach thats essential for B12 absorption
doi:10.1093/ajcn/87.2.362
With proper medical guidance, they are safe, effective, and easy to get
To be metabolized, B12 is combined with a particular protein made in your stomach, without which the vitamin wont be absorbed into your body
Lee JV, Shah SA, Wellen KE
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