This under-appreciated ingredient is often forgotten behind other methods of scalp care but truly deserves much more credit. According to Dr. Michelle Henry, a dermatologist and founder of Skin & Aesthetics Surgery of Manhattan, “Urea is a byproduct of protein breakdown naturally found in the skin. It can benefit the hair by promoting scalp health” (via InStyle). Urea works by absorbing moisture from its surrounding environment and drawing it into the skin (via CeraVe).
Urea’s benefits are quite miraculous. Not only is it known for moisturizing skin, but also for moisturizing hair. Plot twist! A hydrated scalp actually prevents the overproduction of oils that cause dandruff. Urea is also a natural exfoliant, breaking down Keratin on the outer layer of the skin, according to Keston Muijs, co-founder of the brand Grown Alchemist, per Ipsy. This means goodbye flakes! If you suffer from thin hair as well as a dry scalp, urea can create volume by clarifying the scalp. Finally, Urea has soothing properties that reduce inflammation, minimizing the urge to scratch at your scalp. Overall, urea’s properties promote an overall happier scalp and head of hair.
Source: https://www.glam.com/1054519/little-known-haircare-ingredient-change-game-scalp/