Arachidic acid (eicosanoic acid) is a saturated long-chain fatty acid used in cosmetics primarily as an emollient, thickener, and opacifying agent, and as a base for surfactants and emulsifiers. It helps stabilize formulations and condition the skin surface rather than acting as a therapeutic active.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation | Rare | Generally well tolerated; occasional irritation reported in sensitive individuals. |
Contact allergy/sensitization | Very rare | Fatty acids are uncommon sensitizers; isolated case-level reactions possible. |
Comedogenicity (pore clogging) | Uncommon | Long-chain fatty acids may contribute to comedones in acne-prone skin depending on concentration and formulation. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.