Ricinoleth-40 is an ethoxylated castor oil derivative used as a nonionic surfactant, emulsifier, and solubilizer in cosmetic and skincare formulations. It helps blend oil and water phases and solubilize fragrances or oily actives.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation | Uncommon | Possible transient redness or stinging, more likely at higher concentrations or on compromised skin. |
Allergic contact dermatitis | Rare | Sensitization to ethoxylated castor oil derivatives has been occasionally reported. |
Eye irritation | Uncommon | May cause irritation on direct contact with eyes in rinse-off or leave-on products. |
Reactions related to ethylene oxide residues (e.g., 1,4-dioxane traces) | Very rare | Concern relates to manufacturing byproducts of ethoxylation rather than the ingredient itself; controlled by purification. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.