From Root to Ritual

Castor oil is one of the most searched hair ingredients on the internet right now. The claims range from "thickens your hairline in two weeks" to "grows back bald patches" — and dermatologists are pushing back. A 2026 review found ricinoleic acid makes castor oil "an interesting candidate for further study." That is not nothing. But it is also not what TikTok is selling. Here is what castor oil actually does, where it genuinely helps, and how to use it so the thickness you see is real.