Coconut oil actually has clinical evidence behind it for treating brittle hair and head lice, but argan oil doesn't have meaningful proof it does much of anything for hair growth, strength, or scalp issues. Castor oil falls somewhere in the middle with weak evidence for adding shine. Bottom line: the hype around argan oil doesn't match the science.

Dermatologists reviewed 22 published studies comparing what these three oils actually do for hair and scalp health, rather than just relying on marketing claims or cultural tradition.

Funding not disclosed in abstract