How does folic acid affect renal failure?

Anemia: Kidneys are known for their erythropoietic nature ( ie they produce red blood cells in body). Patients in renal failure--- get anemic! Other ingredients (fuel) for producing red cells in body are iron and Folic acid. Since kidneys failed--- we rely on other organs ( ie liver and bone marrow) to do the same-- produce red cells--- by giving patients enough fuel to produce them!