The question of whether calcium and zinc gluconate oral solution contains preservatives is indeed nerve-wracking, but calcium and zinc gluconate oral solution such as 999 Aonuo is free of preservatives, and the instruction manual has the following, each 10 ml contains 600mg of calcium gluconate, 30mg of zinc gluconate, 100mg of lysine hydrochloride, and the excipients are lactic acid, sodium benzoate, aspartame and acesulfame. The excipients are lactic acid, sodium benzoate, aspartame, acesulfame, flavor and purified water. No preservatives, you can feel free to give your child to eat.