Although the science on whether castor oil has a significant impact on eyelash growth is still debatable, there's reason to believe that applying it could help hydrate your lashes regardless.
As board-certified ophthalmologist Ilyse Haberman explained to Cosmopolitan: "Castor oil moisturizes your eyelashes and can make them appear thicker and look like they have more luster." She continued: "It's also possible that it can help prevent lash breakage which, in turn, can lead to healthier growth."
However, castor oil won't necessarily lengthen your lashes. As dermatologist Mona Gohara clarified: "Castor oil may help your lashes look thicker, denser, or fuller, but it won't help them grow."
Using it may prevent lashes from shedding, though. And, as Insider points out, this could result in thicker lashes in the long run, which is the main goal overall. Dr. Joshua Zeichner, the director of cosmetic and clinical research at Mount Sinai Hospital, also confirmed that castor oil could have "moisturizing benefits," which "help condition and thicken the hairs themselves."
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