As for antibiotics: Being previously a quite healthy person, I haven't needed them much prior to B12 deficiency, but because you are more susceptible to infections and less able to heal, these became an inevitable answer sometimes
Proton pump inhibitors Proton pump inhibitors (PPIs) are medications used to treat certain digestive conditions, such as peptic ulcers and gastroesophageal reflux disease
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In humans, GSH is present in a high concentration (1-10 mM) 107 and it is involved in cell differentiation, senescence and death, detoxification of xenobiotics, regulation of enzymatic activity, and synthesis of proteins and nucleotides