Food supplement that helps strengthen the immune system and defenses in catarrhal conditions such as nasal congestion, sore throat, cough, fever and general malaise. It contains, among other active ingredients, N-acetylcysteine, which favors the decrease of mucus viscosity to facilitate expectoration; astragalus, which favors the body's natural defenses, and echinacea, which contributes to the strengthening of the body's natural defenses and the functioning of the respiratory tract.