1. Selected vitamins and trace elements support immune function by strengthening epithelial barriers and cellular and humoral immune responses;Br J Nutr,2007
2. Changes in the immune system are conditioned by nutrition;Eur J Clin Nutr,2003
3. Vitamin A supplementation for preventing morbidity and mortality in children from six months to five years of age;Cochrane Database Syst Rev,2017