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Is castor oil the secret to long lashes? I'm a board certified dermatologist. Let me tell you, there's zero evidence that castor oil is going to grow lashes, brows, or the hair on your scalp. However, it's very moisturizing, it's super viscous, and it coats the lashes, making them appear thicker and cutting down on lash breakage. Now castor oil, the active compound, is something called arsenolaic acid, which actually looks an awful lot like prostaglandins. So in theory, because of the way prostaglandins work on the hair cycle, it could technically improve hair growth. However, we don't have research supporting that yet, so take it with a huge grain of salt. All that to say, putting castor oil on your lid line relatively safe, though eyelid irritation is a possible risk, so be aware.