Limonene provides a nice and fresh citrus scent. It can be found in many plants. It's used in cosmetics because of its low price and pleasant smell.
Safety
The component is in the list of EU Allergens. It reacts with oxygen very fast and can irritate your skin or cause allergic reactions. It also improves the penetration effect of any ingredient. That’s why you should use products with Limonene carefully, especially if you have sensitive skin.