Swiss Herbal Vitamin A & D products are available in a variety of formulations, including Cod Liver Oil. Vitamins A & D are fat soluble vitamins which are stored by the body, transported by lipids and utilized by the body when the physiological need is present. Vitamin A has many functions, and is important for bones, teeth and tissue growth in our body. The combination of vitamin A & D makes them more readily absorbed across the intestial tract.