topical · for sunburn relief
Colloidal Oatmeal Bath
Reviewed by the Nimbera editorial team · Last updated May 2026
How to use
Add 1 cup of finely ground colloidal oatmeal (not regular oats) to a lukewarm bath and stir to dissolve. Soak for 15-20 minutes. Pat (do not rub) skin dry afterwards and follow with a fragrance-free moisturiser. Repeat once or twice daily while itching and inflammation persist. Aveeno makes pre-packaged colloidal oatmeal bath packets for convenience.
How it works
Colloidal oatmeal contains avenanthramides, which inhibit nuclear factor kappa-B (NF-kB) activation, reducing production of inflammatory cytokines and histamine in skin cells. Oat beta-glucans form a protective film on skin that reduces moisture loss. Together, these effects soothe itch, reduce redness, and support the skin barrier during healing.
Where to buy
Aveeno Soothing Bath Treatment packets (Walmart, CVS, Target, Amazon), Anthony's Colloidal Oatmeal powder (Amazon), Gold Bond Colloidal Oatmeal lotion (Walgreens, CVS). Regular grocery rolled oats ground finely in a blender also work.
Typical cost: $8-$18 per box of bath packets
Safety notes
Oat allergy is rare but possible - discontinue if rash worsens. Ensure bath is lukewarm, not hot, as hot water will worsen sunburn inflammation. The bath floor becomes slippery with oatmeal - use a bath mat and take care when stepping out. Do not use on open or blistered wounds.
Drug & supplement interactions
- Always tell your doctor or pharmacist about any supplements you take.
- Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
- Herbal remedies can affect how the body absorbs or metabolises drugs.
- Check drugs.com interactions checker before starting.
This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.