Folic acid, also called folate or vitamin B-12, is found in fresh or lightly cooked green vegetables. It helps your bone marrow make normal blood cells. When your bone marrow has to make more cells, it needs a larger supply of folic acid.
Most people get enough folate in their diet. But if you have PNH, it's a good idea to take 1 mg each day of a man-made form of folate called folic acid.
Bone Marrow Transplant