This estimated average intake level is much lower than the estimated average
requirements published recently by the US Institute of Medicine (IOM) of 10 mg/d (400 IU/d) for all adults, and the current adequate intake (AI) values for Australia of 5 mg/d (200 IU) for adults up to age 50 y, 10 mg/d (400 IU) for those ages 50 to 70 y,
and 15 mg/d (600 IU) for persons ages 70þ y [8].