Oleuropein
INCI: OLEUROPEIN
Reviewed by Kate · Last updated 14 Aug 2026
A polyphenol antioxidant derived from olive leaf extract with potential skin-protective properties
Best For Skin Types
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Usage Frequency
Daily
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What Is Oleuropein?
Oleuropein is a polyphenol compound found naturally in olive leaves. It is extracted and isolated for use in skincare formulations, where it functions primarily as an antioxidant. The ingredient works by neutralising free radicals — unstable molecules that can damage skin cells and accelerate visible signs of ageing.
In formulations, oleuropein is often incorporated into delivery systems such as hydrogel films or other carriers designed to enhance its penetration into the skin. It may also appear in some haircare products, where it can provide conditioning benefits.
Benefits for Your Skin
How It Works
Oleuropein works as an antioxidant by donating electrons to free radicals, stabilising them and preventing them from damaging skin cell structures. This process is particularly relevant in protecting against UV-induced oxidative stress, which contributes to photoaging.
The ingredient also appears to inhibit elastase and collagenase — enzymes that break down structural proteins in skin. When these enzymes are inhibited, the breakdown of collagen and elastin may be slowed, supporting skin firmness. Research suggests oleuropein may work synergistically with its metabolite, hydroxytyrosol, to enhance these effects.
Clinical Evidence & References
In vitro studies suggest oleuropein has moderate antioxidant and photoprotective properties. Research using hydrogel films loaded with olive leaf extract (containing oleuropein) demonstrated the ingredient's ability to protect dermal fibroblasts against UVA-induced damage. Additionally, oleuropein and hydroxytyrosol showed synergistic effects when combined, with improved inhibition of elastase compared to either ingredient alone.
However, most evidence to date comes from laboratory studies rather than clinical trials on human skin. The concentrations used in research are often higher than those in typical skincare products, so direct translation to consumer formulations requires further investigation. More human studies are needed to confirm efficacy at concentrations used in cosmetics.
Published Research
How to Use
Oleuropein is typically used in masks, serums, or other leave-on formulations where it can remain in contact with skin. For best results, use as directed on the product label. If combining oleuropein-containing products with other actives, introduce them gradually to assess tolerance. Store formulations away from direct sunlight to preserve antioxidant potency.
Safety & Precautions
Frequently Asked Questions
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