What colloidal oatmeal is
Oats have been used in baths for irritated skin since Roman times. Colloidal oatmeal is the modern version: the whole grain, including bran, milled to a particle size fine enough to stay suspended in water and spread evenly on skin. Since 2003 it has had an FDA monograph as a skin protectant, a status very few cosmetic ingredients hold.
What it does on the skin
- Relieves itch. Avenanthramides, the oat's own antioxidant polyphenols, reduce histamine-driven itch and inflammation. This is the effect behind oatmeal baths for eczema and chickenpox.
- Holds water. Oat beta-glucans form a film that slows water loss and gives the skin a comfortable, cushioned feel.
- Reinforces the barrier. Oat lipids and proteins help restore the surface film of skin that has been over-cleansed or over-treated.
- Buffers pH. It is mildly acidic, close to the skin's own pH.
What the evidence looks like
Colloidal oatmeal has clinical trials in atopic dermatitis and dry, itchy skin showing improvements in itch, dryness and barrier function within two to four weeks, and a very low rate of reactions even in allergy-prone groups. It is one of the ingredients we trust most for skin in the middle of a flare.
How IKI uses it
Iro Emulsion Gel Moisturizer combines colloidal oatmeal with Centella asiatica, niacinamide, squalane and multi-weight hyaluronic acid in a lightweight gel-emulsion. In its independent 30-day study on 49 people with sensitive skin, 100% said it felt gentle, 96% said their skin felt more moisturized and 90% said their skin felt calmed and soothed.
