Allantoin

Allantoin is a naturally occurring compound that works as a skin conditioner and protectant. It helps calm irritated skin and supports your skin barrier, which is useful if you're dealing with sensitivity or mild irritation from other actives. The ingredient has a gentle track record and plays well with most skin types, including reactive ones. You'll often find it in moisturizers, serums, and soothing formulas. It's not flashy or transformative on its own, but it's a reliable background player that makes your skin feel more comfortable and settled.