Oleuropein is a phenolic glycoside compound with high biological activity, primarily found in the leaves and fruits of the olive tree (Olea europaea). It is widely used in cosmetics and skincare products due to its strong antioxidant properties, helping to protect the skin from oxidative stress and UV damage, reducing signs of aging such as wrinkles and fine lines, stimulating collagen production, and delaying wrinkle formation.

In the pharmaceutical industry, oleuropein is studied for its potential health benefits, including cardiovascular support by maintaining healthy blood pressure, improving blood vessel function, reducing LDL cholesterol levels, and preventing heart and vascular diseases. It also exhibits antimicrobial and anti-inflammatory activities, making it useful in formulations targeting infections and chronic inflammation. Additionally, research suggests it may help lower blood sugar levels, supporting diabetes management.

In the food industry, oleuropein acts as a natural preservative, extending shelf life by inhibiting harmful microorganisms. Its bitter taste is often managed during olive processing to improve palatability, but it is valued in functional foods and dietary supplements, particularly as a concentrated extract from olive leaves, for its overall health-promoting effects.