My main research activities are within the following areas: Content of vitamins in organic produced feed Bioavailability and absorption of different forms of vitamins - Naturally or synthetic - Alcohol or ester bound Biodiscrimination of stereoisomers of alpha-tocopherol Naturally vitamin sources Vitamins for animal health and reproduction Biological activities of carotenes as vitamin A source Fat types and emulgators in relation to digestibility of lipid components Optimising CLA content in milk and meat Sun light as vitamin D source for organic raised animals