The dietary intake of vitamin D is currently below the recommended intake of g vitamin Foods with increased coMent of vitamin D new products with enhanced vitamin D are warranted. Light-emitting diodes (LEDs) are a potential new resouce in food production lines. In the present study the exposure conditions with ultraviolet (uv) LEDs were inv8 the 280-340 nm, fol4achieving optimar vitamin D bio-fortification in Rig skin. A wavelength of 296 nm was found be optimal for vitamin D3 production The umaximum e of 20 produced 3.5-4 ug vitamin D3/cm? pig skin. Vitamin D, produced was indept fient on the combination of time and i the LED source. The increased uv expostffe by uv-LEDs may be readily implemented in existing food production facilities, without major modifications to the process or processing. equipment, for bio-fortifying food products containing pork 2016 Elsevier Ltd. All rights reserved.