Erucic Acid

Erucic acid is a naturally occurring monounsaturated fatty acid with 22 carbon atoms in its chain. It is found in plant oils, particularly rapeseed oil, and is used in skincare formulations as a skin conditioning agent. In cosmetic applications, it functions to help maintain skin hydration and support the skin's natural lipid barrier.As a long-chain fatty acid, erucic acid works alongside other lipids to reinforce the structural integrity of the skin's outermost layers, helping to lock in moisture and maintain skin smoothness.

Erucic acid integrates into the skin's lipid matrix, the layer of fats that sits between skin cells. This helps to fill gaps and reinforce the barrier function, much like mortar between bricks. By doing so, it reduces the amount of water that evaporates from the skin's surface.The ingredient's long-chain structure makes it particularly effective as an occlusive, meaning it forms a protective layer that slows water loss without necessarily being absorbed deeply into the skin.

Erucic acid is typically used as part of a formulated product rather than as a standalone ingredient. It works best when combined with other hydrating and conditioning agents in moisturisers, serums, or barrier-repair products. Apply to damp skin or layer with other products to optimise its hydrating effect. Concentrations are usually kept low within formulations, so follow the product instructions for best results.

Erucic acid is generally well-tolerated in skincare formulations. No significant safety concerns have been reported for topical use at cosmetic concentrations.