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Metformin-related vitamin B12 deficiency occurs as metformin causes reduced vitamin B12 absorption by interfering with the vitamin B12-intrinsic factor complex
This is why women over 50 should opt to get more of the vitamin from fortified foods, supplements or B12 shots
doi:10.1093/advances/nmy023 13Oussalah A, Julien M, Levy J, et al
Folate is abundant in fresh, green feeds, but processing feed rapidly destroys it
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