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Association of the metabolic syndrome with History of Myocardial Infarction and Stroke in the Third National Health and Nutrition Examination Survey

(PubMed) Qin X, Xu M, Zhang Y, et al

Nineteen studies reported that vitamin B-12 intake, status, or supplementation was associated with gut microbiome outcomes, including beta-diversity, alpha-diversity, relative abundance of bacteria, functional capacity, or short-chain fatty acids (SCFA) production

Possible reasons you have a metallic taste in the mouth include: Infections Colds, sinus infections, middle ear infections , and even COVID-19 can cause a metallic taste in your mouth

[1] If you are already taking B12 supplements, inform your doctor, as this may affect test interpretation