Background: Methylmalonic acidemia (MMA) is a rare autosomal recessive metabolic disorder resulting from a genetic defect in methylmalonyl-CoA mutase (MCM) or a defect in the biosynthesis of its cofactor. adenosyl-cobalamin (AdoCbl). The disease is caused by a mutation in six main genes (MUT. MMAA. https://www.bekindtopets.com/save-now-Aqua-Pure-3MFF101-Full-Flow-Drinking-Water-System-Replacement-Cartridge-flash-choice/