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Xi B, Li S, Liu Z, Tian H, Yin X, Huai P,

High doses of levothyroxine may be needed in some patients, and hypoacidic conditions in the gastric environment could influence the drug's absorption, leading to unresponsiveness to the medication

R., et al., Bacteriophagemediated Manipulation of the Gut Microbiomepromises and Presents Limitations, Fems Microbiology Review 44, no

Other symptoms of vitamin B12 deficiency include: Rapid breathing or shortness of breath Headaches Indigestion Diarrhea Loss of appetite Problems with vision Feeling weak or tired Psychological problems, which can range from mild depression or anxiety to confusion and dementia Blood tests are the most common way to diagnose a vitamin B-12 deficiency