Shine booster leave-in cream for dull hair.Garnier Ultra Doux Black Charcoal & Nigella Seed Oil Leave-in Cream is a true formula for shine and style ease. Combining Nigella Seed Oil, also known as Black Seed, a valuable natural ingredient known to soothe and restore hair shine, with Charcoal, recognized for its purifying characteristics, in a silicone-free natural creamy texture that won’t weigh down your hair.