Chemical compound also called 5-ureidohydantoin or glyoxyldiureide. There are several beneficial effects of allantoin as an active ingredient in skin care products: a moisturising and keratolytic effect, increasing the water content of the extracellular matrix and enhancing the desquamation of upper layers of dead skin cells, increasing the smoothness of the skin; promotion of cell proliferation and wound healing; soothing, anti-irritant, and skin protectant effect by forming complexes with irritant and sensitising agents.

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