Awful Tasting Cod Liver Oil Did Do Some Good

... diseases such as rickets, caused by a lack of Vitamin D. ``The early mixtures probably contained very little vitamin A because it is easily broken down when exposed to the air and light. Vitamin D was much more robust and survived the early crude ...

http://www.scoop.co.nz/stories/SC1304/S00039/awful-tasting-cod-liver-oil-did-do-some-good.htm