Every French girl — and Meghan Markle — swears by this hair oil
..Meghan Markle uses hair oil to keep her hair looking shiny. Evan Agostini/Invision/AP. French it girls and Meghan Markle use Leonor Greyl's hair oil. Markle's hairstylist, Michael Silva, said he uses this oil on all his clients, Kardashian clan..