Wnd 2 Powder, Non-Gmo Formula, Vanilla Scent. WND 2 is an iron-fortified medical food powder that is free of nonessential amino acids for children and adults with documented inborn errors of the urea cycle (waste nitrogen disorders). The product provides the essential amino acids as well as carbohydrate, fat, essential fatty acids, vitamins and minerals. Use under direct and continuing supervision of a doctor.