Limonene creates citrusy smells and tastes. It can be found abundant in citrus fruits. Its anti-inflammatory effect has been well studied and is also thought to help control respiratory system injuries. Limonene is used for obesity, cancer, and bronchitis, but no good scientific evidence supports these uses.
Limonene is used as a flavoring in foods, beverages, and chewing gum. In pharmaceuticals, limonene is added to help medicinal ointments and creams penetrate the skin.