Morley answers some key questions with Matt Blackburn, such as: is cod liver oil (CLO) the same as fish oil? Do the polyunsaturated fatty acids in it suppress your thyroid? What is the role of retinol in the body? Does vitamin A protect against lipid peroxidation in cell membranes? What are the role of fat soluble vitamins in the body? And explains why retinol is the star of Cod Liver Oil.