A popular source of allantoin is the extract of comfrey, a species of herb native to Europe. Named for the allantois, a structure involved in the exchange of nutrients and waste for developing embryos. Considered an effective moisturizing ingredient when used in skincare, and its gentle, non-irritating qualities make it an excellent addition to anti-aging products for those with sensitive or easily irritated skin. It’s a known keratolytic, meaning that it can increase the water content of cells while also aiding in the process of desquamation of the outer layers of skin. May also help to: Increase skin smoothness, aid in wound healing, promote cell proliferation and longevity (Aging Cell)