Colloidal oatmeal: what the evidence shows for dry, itchy-feeling skin
Finely milled oats are one of the few botanicals recognised by the US FDA as a skin protectant. Here is what trials show for dryness and itch, and how CSL formulation scientists use colloidal oatmeal.
By CSL Formulation team · Evidence checked by CSL scientists
At a glance
- What it is
- Oat kernels ground to a fine powder that disperses in water; contains starches, beta-glucan, lipids and avenanthramides
- Main benefits
- Relief of dryness and itch; better hydration and barrier in dry, eczema-prone skin
- Levels tested in trials
- 1% colloidal oatmeal cream in most recent trials; US OTC minimum 0.007%
- Time to results
- Days for itch and comfort; 2 to 6 weeks for dryness and eczema scores
- Watch for
- Known oat allergy; microbial quality of a natural powder; OTC rules if drug claims are made in the US
01What is it?
Colloidal oatmeal is whole oat kernel milled so finely that it stays suspended in water. It is used in creams, lotions, washes and bath soaks. In the US it is an approved over-the-counter skin protectant.
02What it does
Oat starches and beta-glucan hold water and form a protective film, oat lipids support the barrier, and avenanthramides calm inflammation and itch. In trials this shows as better hydration, less dryness and itch, and eczema scores similar to a prescription barrier cream.
03The evidence
Studies below were checked against the publisher, DOI or journal record on 26 Sep 2026. We list design and size so you can judge the strength of each result.
| Study | Design | Who and how long | What it found |
|---|---|---|---|
| Farishta et al. 2026, Archives of Dermatological Research (Springer Nature) Source | Systematic review and meta-analysis | 2 randomised trials pooled (139 people) plus 8 other studies, atopic dermatitis | Hydration rose by 5.85 corneometer units versus comparators (p<0.001); severity and itch were similar to a prescription barrier cream. |
| Lisante et al. 2023, Journal of Dermatological Treatment (Taylor & Francis) Source | Randomised trial against a prescription barrier cream | 49 Black or African American children aged 2 to 15 with mild to moderate eczema, 3 weeks, 1% colloidal oatmeal cream | EASI score fell by 2.4 points versus 2.1 with the prescription cream; at least as effective and as safe. |
| Sobhan et al. 2020, Clinical, Cosmetic and Investigational Dermatology (Dove Press) Source | Randomised, double-blind, vehicle-controlled trial | 79 adults with chronic irritant hand eczema, 1% colloidal oatmeal cream vs base cream after a corticosteroid course, 6 weeks | The oatmeal group kept its improvement at week 6, while symptoms came back in the base cream group. |
| Lisante et al. 2017, Journal of Dermatological Treatment (Taylor & Francis) Source | Randomised, double-blind trial against a prescription barrier cream | 90 children aged 6 months to 18 years with mild to moderate eczema, 3 weeks, 1% colloidal oatmeal cream | EASI improvement was non-inferior to the prescription cream, with few side effects and better quality of life in both groups. |
| Criquet et al. 2012, Clinical, Cosmetic and Investigational Dermatology (Dove Press) Source | Safety programme and dry-skin efficacy studies | 2,291 people patch tested; in-use and dry-skin studies of colloidal oatmeal products | Low-level reactions in 1.0% and one doubtful reaction at challenge; hydration lasted up to 2 weeks after stopping. |
Colloidal oatmeal reliably improves hydration and comfort in dry and eczema-prone skin and is very well tolerated. Its effect on eczema scores matches barrier creams rather than medicines. Cosmetic wording such as "soothes dry, itchy-feeling skin" and "suitable for eczema-prone skin" fits; "relieves itching due to eczema" is a US OTC drug claim.
04How CSL formulation scientists use it
- Recent trials use 1% in creams; this is a useful benchmark. The US OTC minimum of 0.007% applies only to monograph skin protectant products.
- Disperse the powder fully in the water phase and check viscosity; high levels thicken and can feel gritty. It suits creams, lotions, washes and bath soaks.
- Control microbial quality of the raw material and use a robust preservative system: oat is a natural substrate for microbes.
- Combine with barrier lipids such as ceramides or shea for dry and eczema-prone skin products. Note gluten and oat allergy questions on labels and in consumer care answers.
05Regulatory and claims
In the US, colloidal oatmeal is a skin protectant active in OTC Monograph M016 (21 CFR 347.10) at a minimum of 0.007%, or 0.003% with mineral oil. Monograph products may state that they "temporarily protect and help relieve minor skin irritation and itching due to rashes, eczema, poison ivy, oak or sumac, or insect bites", but must then follow OTC drug rules. Outside that route, and in other markets, claims stay cosmetic. CSL regulatory specialists confirm the status in each target market.
06Questions brands ask
Is colloidal oatmeal the same as oat extract?
Not exactly. Colloidal oatmeal is the whole milled kernel and is the form defined in the US monograph. Oat extracts contain only some components and have separate, smaller evidence.
Can a product say it helps eczema?
In the US only as an OTC skin protectant that follows the monograph. As a cosmetic, say "suitable for dry, eczema-prone skin" or "soothes dry, itchy-feeling skin".
Is it safe for babies and children?
Trials included children from 6 months, with few side effects. People with a known oat allergy should avoid it.
07References
- Farishta A, Bavaro N, Chang C, Chovatiya R. Clinical efficacy and skin barrier impact of colloidal oatmeal in atopic dermatitis: a systematic review and meta-analysis. Arch Dermatol Res. 2026;318:168. Link
- Lisante TA, et al. A 1% colloidal oatmeal OTC cream is clinically effective for the management of mild to moderate atopic dermatitis in Black or African American children. J Dermatolog Treat. 2023. Link
- Sobhan M, Hojati M, Vafaie SY, Ahmadimoghaddam D, Mohammadi Y, Mehrpooya M. The efficacy of colloidal oatmeal cream 1% as add-on therapy in the management of chronic irritant hand eczema: a double-blind study. Clin Cosmet Investig Dermatol. 2020. Link
- Lisante TA, Nuñez C, Zhang P. Efficacy and safety of an over-the-counter 1% colloidal oatmeal cream in the management of mild to moderate atopic dermatitis in children: a double-blind, randomized, active-controlled study. J Dermatolog Treat. 2017;28(7):659-667. Link
- Criquet M, Roure R, Dayan L, Nollent V, Bertin C. Safety and efficacy of personal care products containing colloidal oatmeal. Clin Cosmet Investig Dermatol. 2012;5:183-193. Link
- US FDA. 21 CFR 347.10 Skin protectant active ingredients. Link
- US FDA. OTC Monograph M016: Skin Protectant Drug Products for Over-the-Counter Human Use. 2021. Link
Used in: Sensitive skin
Update log
- Evidence reviewed and page published by CSL scientists
This page summarises published research for brands and formulators. It is general information, not medical advice, and results in studies depend on the full formula tested.
