Allantoin is a plant extract that is famous for its healing, soothing, and anti-irritating properties. Allantoin is used in skin care products because of its ability to heal minor wounds and promote healthy skin. Several clinical studies have demonstrated its effectiveness in skin repair, softening, and protection.
Source: Korać RR, Khambholja KM.; Potential of herbs in skin protection from ultraviolet radiation. Pharmacogn Rev. 2011 Jul;5(10):164-73.