RCT No4 shows vitamin D supplement as allergy risk

Nearly forgot to mention the new study  of Jenni Rosendahl  who compared high-dose to low-dose vitamin D supplementation effects. The Vitamin D Intervention in Infants (VIDI) study was a randomized controlled 24-month trial of daily 400 IU or 1200IU vitamin D supplementation administered to healthy infants that evaluated the effect of vitamin D supplementation on bone health and infections.

table III

I would say sensitization against one of the most common allergen in this age group happens already in the low dose group while the higher dose leads to a further 2.2fold increased disease risk.

Would be really  important to have any unexposed control group here.