Castor Oil (Ricinus Communis)
Castor Oil is rated 1–2 on the comedogenic scale. Published ratings for it disagree, so it sits across the 1-to-2 range, and the 2 end is the one to plan around if your skin breaks out easily.
A thick, viscous oil used to lock in moisture and often used in lip glosses and soaps.
- Comedogenic rating
- 1–2 out of 5 (sources disagree)
- Band
- Low risk: Tolerated by most people, including most sensitive skin.
- Composition
- Natural Oil / Oils (High in ricinoleic acid)
- Also written as
- Ricinus Communis
What a 1–2 means in practice
One and two are the low band. Most people, including most people with sensitive skin, use ingredients rated here without congestion. Very oily or very acne-prone skin sometimes reacts to a 2 over a long run.
Two things change what this number is worth. Ingredients are listed in descending order of concentration, so castor oil near the top of a label matters far more than castor oil at the bottom. And the rating describes the raw ingredient on its own. A 2006 review in the Journal of the American Academy of Dermatology found that a rating for a single ingredient does not reliably predict how a finished formula behaves on human skin. The full story of the scale is here.
Common questions
- Is castor oil comedogenic?
- Castor Oil is rated 1–2 on the comedogenic scale. Published ratings for it disagree, so it sits across the 1-to-2 range, and the 2 end is the one to plan around if your skin breaks out easily.
- Is castor oil non comedogenic?
- Not exactly. Castor Oil is rated 1–2, which is the low risk band rather than 0. Low risk and non-comedogenic are different things, and only a 0 means the second one.
- What is castor oil's comedogenic rating?
- 1–2 out of 5. It is classed as Natural Oil / Oils (High in ricinoleic acid).
Sources for this rating
- Kligman AM, Kwong T. “An improved rabbit ear model for assessing comedogenic substances.” British Journal of Dermatology, June 1979;100(6):699–702. (opens in a new tab) The rabbit-ear assay that produced most of the 0–5 numbers still quoted today.
- Fulton JE Jr, Pay SR, Fulton JE 3rd. “Comedogenicity of current therapeutic products, cosmetics, and ingredients in the rabbit ear.” Journal of the American Academy of Dermatology, January 1984;10(1):96–105. (opens in a new tab) The published ingredient-by-ingredient ratings that most comedogenic lists, including this one, trace back to.
- Draelos ZD, DiNardo JC. “A re-evaluation of the comedogenicity concept.” Journal of the American Academy of Dermatology, March 2006;54(3):507–512. doi:10.1016/j.jaad.2005.11.1058 (opens in a new tab) Found that animal-model results did not reliably predict what happened on human skin, and that a rating for a single ingredient does not tell you how a finished product will behave.