Ricinus Communis (Castor) Seed Oil
Ingredient Info
Castor seed oil is a natural oil extracted from castor plant seeds that acts as a skin conditioner and emulsifier in skincare products. It helps soften skin, stabilize formulas, and can provide mild UV protection.
Benefits
- Softens and conditions skin
- Helps stabilize product formulas
- Mild natural UV absorption
- Generally well-tolerated on skin
Potential concerns
- May enhance penetration of other ingredients through skin (can be beneficial or problematic depending on formula)
- Potential for sensitivity in individuals with castor seed allergies (rare)
Science: Multiple safety assessments by the Cosmetic Ingredient Review Expert Panel (2007, 2025) have concluded castor seed oil and related derivatives are safe for cosmetic use at typical concentrations. The oil is free of ricin (a toxic protein) because ricin does not partition into the oil during extraction. Animal and human safety data support its use in concentrations up to 81% in products like lipsticks.
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