Triethylhexanoin

Triethylhexanoin is a synthetic ester derived from glycerin and fatty acids. It functions as an emollient and conditioning agent in skincare formulations, helping to soften and smooth the skin's surface. It appears in roughly 2% of skincare products, often used alongside other actives.Beyond its conditioning properties, triethylhexanoin has been studied as a potential penetration enhancer — a substance that may help other ingredients move through the skin's outer layers more effectively. This makes it particularly useful in formulations designed to optimise the delivery of active compounds.

Triethylhexanoin works primarily by coating the skin's surface, which reduces water loss and softens dry, rough areas. Because it is a small-molecule oil, it integrates into the skin's natural lipid matrix rather than sitting on top of it.Research suggests it may also facilitate the movement of active ingredients across the stratum corneum (the skin's outermost barrier). This appears to work by temporarily modifying the skin's lipid structure, creating a more permeable pathway for other molecules — though this effect depends on the specific actives used alongside it and the overall formulat…

Triethylhexanoin is typically used in serums, essences, and lightweight moisturisers at concentrations below 5%. It works well when layered with water-based products or vitamin C formulations, where it may enhance absorption. Apply to clean skin before heavier creams if your routine includes multiple steps.

Triethylhexanoin is generally well-tolerated and non-sensitising for most people. Those with oily or acne-prone skin should patch test first, as any occlusive oil can theoretically contribute to congestion in susceptible individuals.