Limonene is a natural organic and aromatic compound found in the peels of citrus fruits like oranges, lemons and limes. It's commonly used in skincare products including creams, lotions, serums and cleansers to create a pleasant citrus fragrance, which can improve the sensory experience during use. It's often included in formulas for its aromatic qualities and not necessarily for specific skincare benefits. But, Limonene can be found in some natural or organic skincare products, where it may be touted for potential antioxidant or skin-soothing properties from its citrus origin.