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For example: Metformin: This is a treatment for prediabetes and diabetes which may reduce the absorption of vitamin B12 as well as significantly reduce your levels of serum vitamin B12

J Mol Struct 1127:675688

Bosentan added to sildenafil therapy in patients with pulmonary arterial hypertension

Gut microbiota metabolites can be regarded as mediators of the interaction between gut microbiota and their hosts, and some gut microbiota metabolites have antioxidant, anti-inflammatory, and immune cell-regulating activities, which may be potentially beneficial for the treatment of ITP ( 3.1 Short-chain fatty acids Short-chain fatty acids (SCFAs) are mainly produced by intestinal anaerobes fermenting dietary fiber and absorbed carbohydrates, including acetic acid, propionic acid, and butyric acid, and are inhibitors of histone deacetylase (HDAC) and G-protein-coupled receptors (GPCRs)