A beverage contains a high concentration of glucosamine in a stable condition, contains a high concentration of calcium, forms few precipitates, and has a good taste. The beverage comprises glucosamine or a salt thereof, calcium, phosphoric acid, malic acid, and citric acid. The content of glucosamine or the salt thereof is 1.0 mass % or more in terms of glucosamine, the content of calcium is 0.15 mass % or more, and the pH of the beverage is 3.4 or less.