With its bright and joyful aroma, Lemon essential oil benefits skin and hair as much as its aroma enhances your environment. This best-selling oil can be used in a variety of ways: Mix it with your cleaning products, use it during your nighttime skin care routine, or add a drop to your conditioner for a great scent. Because citrus oil can cause photosensitivity, avoid applying Lemon to exposed skin before spending time outside.