Summary: Background: The high variability in clinical and metabolic presentations of inborn errors of cobalamin (cbl) metabolism (IECM). such as the cblC/epicblC types with combined deficits in methylmalonyl-coA mutase (MUT) and methionine synthase (MS). are not well understood. They could be explained by the impaired expression/activity of enzymes from other metabolic pathways. https://parisnaturalfoodes.shop/product-category/ortho-core/