Allantoin is an ingredient often used to treat dry, rough, and itchy skin due to its moisturizing, skin smoothing, and wound healing properties.

Allantoin occurs naturally. Comfrey, a shrub that grows in some parts of Asia, North America, and Europe, is a reservoir of allantoin. The roots of comfrey contain allantoin and are often used to prepare ointments, creams, and lotions