Portion of the oat plant that contains antioxidant and anti-inflammatory properties. Research has shown that topical application to skin can protect fibroblasts (collagen- and elastin-producing cells in skin) from the oxidation that results from free-radical damage, which means the collagen isn’t harmed. 
- Feng B, Ma L, Fang Y, Mei Y, Wei S. Protective effect of oat bran extracts on human dermal fibroblast injury induced by hydrogen peroxide. J Zhejiang Univ Sci B. 2013;14(2):97-105.