2. Food supplements. 2.2. Supplementation of vitamin D.

Level of recommendation	Statement
A	Background: Current studies show no protective effect of vitamin D supplementation during pregnancy, breastfeeding or in children with regard to allergy prevention in children.
	Recommendation: Pregnant women and healthy infants or older children should not take vitamin D supplements for the purpose of allergy prevention. (A)
	Statement: The recommendation established in Germany to supplement infants with vitamin D (400 – 500 IU/day) up to the child’s second early summer remains unchanged.
Level of evidence	Supplementation during pregnancy:
	Wolsk 2017a und b (1+); Zosky 2014 (2–); Maslova 2013 (2–); Litonjua 2016/2020 (1+); Chaves 2016 (2+); Brustard 2019 (2+)
	Supplementation in infancy and early childhood: Nwaro 2017 (2+), Forno 2020 (1+)
Level of consensus:	Strong consensus