Ingredient review
Ricinoleic Acid
INCI: RICINOLEIC ACID
A gentle, plant-derived fatty acid that hydrates and soothes skin without clogging pores.
In plain English
Ricinoleic acid is a natural fatty acid found in castor oil. In skincare, it helps soften and smooth the skin by filling in gaps between skin cells, locking in moisture. It also has mild anti-inflammatory effects, which can calm redness and irritation. Because it's non-comedogenic, it's a good choice for oily or acne-prone skin types.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- natural
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Ricinoleic Acid is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Ricinoleic Acid.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
Ricinoleic acid is a monounsaturated fatty acid that makes up about 90% of castor oil. It is extracted from the seeds of the castor plant (Ricinus communis) and is used in cosmetics as an emollient, surfactant, and cleansing agent.
How it works
When applied to the skin, ricinoleic acid integrates into the lipid barrier, helping to reduce water loss (transepidermal water loss, or TEWL) and keep skin hydrated. Its unique molecular structure also gives it mild antimicrobial and anti-inflammatory properties, which can help soothe irritated skin and support a balanced skin microbiome.
Pros
Gentle moisturizer
Ricinoleic acid hydrates without clogging pores, making it suitable for oily and acne-prone skin types.
Calms irritation
Its anti-inflammatory properties can help reduce redness and soothe sensitive skin, especially after sun exposure or shaving.
Cons and cautions
Potential allergen
Though rare, some people may be allergic to castor oil derivatives, leading to contact dermatitis.
Limited research on topical use
Most studies focus on castor oil as a whole; specific data on ricinoleic acid in skincare is still emerging.
Best for
- People with dry or dehydrated skin looking for a lightweight moisturizer
- Those with sensitive or easily irritated skin who want a gentle, soothing ingredient
Use caution if
- Individuals with a known allergy to castor oil or its derivatives
Usage tips
Safety summary
Ricinoleic acid is considered safe for topical use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though individuals with a castor oil allergy should avoid it. Always patch test new products.
Research notes
Research supports ricinoleic acid's moisturizing and anti-inflammatory effects, primarily through studies on castor oil. More targeted studies on the isolated fatty acid are needed, but existing evidence is positive and consistent with its traditional use.
Common label clues
- Typical concentration
- 0.5% to 5% in leave-on products; up to 10% in rinse-off cleansers
- Regulatory status
- Approved as a safe cosmetic ingredient by the Cosmetic Ingredient Review (CIR) panel and the European Commission. No known restrictions on concentration in leave-on or rinse-off products.
- Common uses
- Moisturizers, Cleansers, Lip products, Hair conditioners
- Environmental note
- Castor oil is a renewable plant-based resource, but its cultivation can involve pesticide use. Look for organic or sustainably sourced castor oil if environmental impact is a concern.
Good to know
- Ricinoleic acid is often used in lip balms because it helps create a smooth, non-sticky feel.
- It is also a common ingredient in cleansing oils and balms due to its ability to dissolve makeup and sunscreen.
Common questions
What is Ricinoleic Acid in beauty products?
Ricinoleic acid is a natural fatty acid found in castor oil. In skincare, it helps soften and smooth the skin by filling in gaps between skin cells, locking in moisture. It also has mild anti-inflammatory effects, which can calm redness and irritation. Because it's non-comedogenic, it's a good choice for oily or acne-prone skin types.
What does Ricinoleic Acid do in a beauty product?
When applied to the skin, ricinoleic acid integrates into the lipid barrier, helping to reduce water loss (transepidermal water loss, or TEWL) and keep skin hydrated. Its unique molecular structure also gives it mild antimicrobial and anti-inflammatory properties, which can help soothe irritated skin and support a balanced skin microbiome.
Is Ricinoleic Acid safe for most people?
Ricinoleic acid is considered safe for topical use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though individuals with a castor oil allergy should avoid it. Always patch test new products.
Who should be careful with Ricinoleic Acid?
Individuals with a known allergy to castor oil or its derivatives
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.