Can Vitamin D Treatment Help Treat Moderate to Severe Atopic Dermatitis in Young Children? the D-Vex Pilot Study

Inclusion Criteria: * moderate to severe atopic dermatitis with a SCORAD ≥ 20 at baseline. * aged between 1 ≤ 12 years of age at the time of randomisation. * regularly ingest the recommended dietary intake (RDI) of calcium and plan to do so for the next 3 months * have a legally acceptable representative capable of understanding the informed consent document and providing consent on the participant's behalf. Exclusion Criteria: * use of vitamin D supplementation, including a stoss dose of vitamin D in the previous year, or daily supplementation in the past month * drink vitamin D fortified formula (all formulas) as the main milk intake * received oral steroids within the past 6 months * received oral immunosuppression in the past (cyclosporine, azathioprine, methotrexate) * received UV therapy in the past 12 months * have been fully formula fed within the past 6 months * ave renal or liver or gastrointestinal (e.g.: coeliac, inflammatory bowel disease) disease * receiving thiazide-type diuretics or anticonvulsant therapy * have ever been diagnosed with Hypercalcaemia, Hypertension or Rickets * unable to provide consent without the aid of an interpreter * in the opinion of the Investigator, are unable to follow the protocol