 It is hypothesized that total intakes half of the EAR of 400 IU i.e. 200 IUd as a typical intake by young children will result in exceeding a serum 25OHD of 40 nmolL as the population target that aligns with the current EAR value. Intakes reaching the RDA of 600 IU will support serum concentrations of 25OHD over 50 nmolL and enable further investigations regarding functional outcomes in bone such as BMC and BMD. 