Why ox liver cures night blindness and why cod liver oil and sunshine can help to cure rickets?
I can’t speak to the ox, but mammalian livers are rich in vitamin A, a necessary ingredient for night vision. The ultraviolet rays in sunshine penetrate the skin for a few millimeters and lead to the body producing Vitamin D. Cod liver oil is also high in vitamin D. Lack of vitamin D in childhood leads to an abnormal growth of the ends of the bones, a condition known as rickets.
