Ricinoleic Acid

Ricinoleic acid is a naturally occurring fatty acid that comprises approximately 90% of castor oil's composition. In skincare formulations, it functions as a surfactant and emulsifier — ingredients that help dissolve oils and allow them to mix with water-based components. This dual action makes it useful in cleansing products where it helps lift impurities and excess sebum from the skin's surface.As an emollient, ricinoleic acid also helps to soften and condition the skin barrier, contributing to the texture and spreadability of creams and oils.

Ricinoleic acid works by mimicking the structure of soap molecules — it has one end that attracts water and another that attracts oils. This allows it to surround oily substances (like sebum and makeup residue) and lift them away, making it easier to rinse them off the skin. This detergent-like behaviour is particularly useful in gel cleansers and oil-based formulations.When used as an emulsifier, ricinoleic acid positions itself at the boundary between oil and water droplets, preventing them from separating. This is especially valuable in moisturisers and serums that combine multiple textu…

Ricinoleic acid is typically encountered in cleansing products rather than leave-on treatments. When using a cleanser containing this ingredient, apply to damp skin, massage gently for 30–60 seconds, then rinse thoroughly with water. If incorporated into an emulsified moisturiser or serum, apply as directed on the product label. Given its surfactant properties, it is not typically a concern to use daily, though individual skin tolerance will vary.

Ricinoleic acid is approved for food use and is generally considered safe in cosmetic formulations at typical concentrations. However, as a surfactant, it can be irritating at higher concentrations or in individuals with sensitive skin. Those prone to irritation or sensitisation should patch-test products containing this ingredient first, particularly if it is a primary cleansing agent.