A form of oatmeal used in cosmetics and skincare products. It is produced by finely grinding oats, then boiling them. Research shows avenathramides, potent types of antioxidants found in oats (and colloidal oatmeal), can help treat certain types of skin inflammation.  They are able to do this in part by inhibiting the release of proinflammatory cytokines and histamine, substances that are secrete in response to skin inflammation and allergies.  A high concentration of beta-glucan and starches in colloidal oatmeal also mean it has water-binding properties and is an effective skin protectant.  In fact, the United States Food & Drug Administration (FDA) categorizes colloidal oatmeal as a skin protectant, allowing it to be listed as an active ingredient on skincare products. 
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- Food and Drug Administration. CFR – Code of Federal Regulations Title 21. [Internet] [Cited April 2016] Available from: http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/cfrsearch.cfm?fr=347.50