In this study, we focused on the effect of β-glucan supplementation of children with chronic respiratory problems. We measured the
levels of cortisol, salivary IgE and cotinine in 56 children and evaluated the effect of 30 day supplementation with 100 mg/day oral
dose of yeast-derived β-glucan. Our results showed strong decrease of cotinine and cortisol levels in saliva of β-glucan-supplemented
children.