PROBLEM TO BE SOLVED: To provide a composition containing organic acid to relax a strong acidity of at least one organic acid chosen from a group consisting of acetic acid, malic acid, tartaric acid, lactic acid and citric acid beverage and a method to relax acidity of organic acid.SOLUTION: A strong acidity of organic acid is relaxed by blending glutamine to at least one organic acid chosen from a group consisting of acetic acid, malic acid, tartaric acid, lactic acid and citric acid.