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However, a study found that taking 1,000 mcg of B12 by mouth or injecting the vitamin achieved similar results in treating the deficiencies

From my point of view, this is a real do not try this at home scenario

Understanding how the microbiome is involved in establishing, maintaining, and reversing obesity has been an active area of research 14,15,16 , and has included studies investigating links between the microbiome and obesity-related comorbidities such as non-alcoholic fatty liver disease (NAFLD) and non-alcoholic steatohepatitis (NASH) 17,18

Clinical data is not

Sources Food sources Only certain bacteria and archaea can synthesize vitamin B 12 (123, 124)