Molecular model showing a beta-lactoglobulin protein molecule forming a dimer with two fatty docosahexaenoic acid (DHA, sphere model in the centre) molecules. Beta-lactoglobulin is a major whey protein, found in cow's milk. It is involved in the transportation of fatty acids. DHA is found in every cell of the human body and it is an important structural component of the skin, eyes and brain. DHA can be obtained in the diet from seafood and fish oil.