Mustard oil is good for eyebrows and can help make your eyebrows thicker. It also contains panthenol, lutein, and zeaxanthin (a type of antioxidant), all of which are beneficial for the skin. When applied topically to the eyebrows, it can help in lightening them up and providing fuller looking brows. Additionally, using mustard oil as an eyebrow primer will help keep your makeup in place all day long!