The main sources of iodine in the UK diet come from milk and dairy products in all age groups from pre-school children to the elderly13-18. A glass (200ml) of semi-skimmed milk will provide a child of 6 years with 96% of their daily requirement for iodine and an adult (19-50 years) with 44%, but there is some seasonal variation in the iodine content of milk8,21.