“Using metformin and a mitochondria/complex I (mCI)-targeted analog of metformin (norMitoMet) in experimental pairs of …-activated protein kinase (AMPK)-, serine hydroxymethyltransferase 2 (SHMT2)- and mCI-null cells, we provide evidence that metformin … SAM :SAH ratio-related methylation capacity by targeting … mitochondrial one-carbon flux and CI activity.”