Kérastase Genesis Serum Fortifiant

No. Kérastase states that Genesis is not a hair loss product. It addresses hair fall due to breakage, meaning strands that snap from brushing, heat styling or chemical processing, not genetic or medical hair loss. For root-level hair loss, the brand recommends seeing a dermatologist.

Every day, on a damp, towel-dried scalp after shampoo and conditioner or a hair mask. On days you don't wash, you can apply it to a dry scalp. Don't rinse it out; blow-dry or let your hair air-dry.

One dose is one pipette filled to the black dosage line. Use up to four doses, section by section, focusing on the areas where you notice lower density or the most breakage, then massage over the whole scalp.

Yes. Kérastase says it suits all hair types, including colored, highlighted, balayaged and chemically processed hair, and that the silicone-free formula won't interfere with color vibrancy.

No. It is a lightweight formula with a non-greasy finish that leaves no residue once dry, so it won't flatten fine or thin hair.

A woody citrus scent: lime, bergamot zest and cedrat on top, rose, bergamot flower and basil at the heart, and vetiver, musk and tonka bean at the base.

Yes. It is designed to work with the rest of the Genesis range, and Kérastase notes it can also follow the shampoo and conditioner of its other collections, for example a nourishing line if your hair is also dry.

Opened hair care can't be resold, so it is returnable only if it arrived damaged or was the wrong item. Sealed and unopened, you have 30 days from delivery to start a return.