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Description
However, certain populations are at higher risk of deficiency, including older adults, vegans and vegetarians, individuals with malabsorption disorders (such as pernicious anaemia or coeliac disease), and those taking long-term proton pump inhibitors or metformin

18 Brown-BorgH
doi: 10.1007/s00432-024-05777-4

Sauerbier et al

PMC 1163421

If you have a dog, you know the sound
