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The American journal of clinical nutrition , 94 (3), 847853
Deficiency is particularly common in elderly people, because the ability to absorb vitamin B12 can decrease with age ( Other people at risk of deficiency include those who have had intestinal surgery, including weight loss surgery
The second dominant phylum Bacteroidetes is mainly represented by the genera Bacteroides and Prevotella ( The microbial community provides numerous benefits for the host contributing to metabolism of nutrients, drugs, xenobiotics, maintenance of gut barrier function and intestinal immune homeostasis (Table 1 summarizes information regarding the experimental conditions and the identified microbiota-produced GRP metabolites
But stress, medications, aging, and bad health can deplete glutathione levels
FDA approval requires an application with evidence on quality, safety, and effectiveness for a specific medical use
