Vitamin D, New RDA* 5 µg
Vitamin D is a fat-soluble vitamin. This means you don't need it every day because any of the vitamins your body doesn't need immediately is stored for future use.
Vitamin D3 (cholecalciferol) is produced photochemically from 7-dehydrocholesterol in the skin by exposure to sunlight or ultraviolet light. Vitamin D2 is formed similarly from ergosterol in plants, fungi and lower life forms.
*Sourced from EFSA WEBSITE