Phong C, Lee V, Yale K, Sung C, Mesinkovska N. Coconut, castor, and argan oil for hair in skin of color patients: a systematic review. J Drugs Dermatol. 202221(7):751-757. "Castor oil is commonly used as a natural treatment for eyelash and eyebrow growth," says Zeichner. Proponents on social media are often seen applying the oil directly to their l