Vitamin D content of cows' milk produced in Northern Ireland and its efficacy as a vehicle for vitamin D fortification: a UK model.

Cows' milk is a relatively poor source of vitamin D but figures listed in UK food composition tables may be outdated. Samples of milk were collected for 1-year and vitamin D concentrations analysed using HPLC. Milk consumption data were obtained from the National Diet and Nutrition Survey (Years 1-4).