Genesis Serum Fortifiant
A lightweight silicone-free scalp serum designed to strengthen weak hair, reduce breakage-related hair fall, and support the scalp.
A strong premium scalp serum for people focused on breakage-related hair fall and daily strengthening support — backed by the clinical formulation approach Kérastase is known for.
Most drugstore anti-hairfall products are either medicated (pyrithione zinc, minoxidil) or generic conditioning formulas without real differentiation. Kérastase Genesis takes a very specific position — breakage-driven hairfall — with a serum format and clinical credibility that sets it apart from generic alternatives, even at the premium price.
Daily, applied to the scalp after washing or on dry scalp days between washes. Massage in for 1–2 minutes to support circulation and absorption. No rinse required.
People who heat-style frequently, colour-process their hair regularly, or have noticed increased breakage and snapping rather than full-strand shedding. Also ideal for anyone who wants a premium daily scalp serum with Kérastase's salon-brand credibility behind it.
If your hair loss is not breakage-related. Kérastase Genesis is specifically for mechanical and chemical fragility — it is not a regrowth treatment, not a hormonal hairloss solution, and not equivalent to minoxidil. Misidentifying the cause of hair loss means mismatching the treatment.
Scalp and skin reactions to fragrance are possible — if the scalp becomes reactive, itchy, or irritated, discontinue and assess whether the fragrance is a trigger.
- The full Kérastase Genesis shampoo and conditioner line for a coordinated strengthening haircare system
- A scalp massage with the serum to boost circulation and absorption
- The Ordinary 100% Organic Cold-Pressed Argan Oil on dry hair lengths alongside this scalp treatment
Best For
- Weakened hair
- Hair fall due to breakage
- Scalp-focused routines
- Daily strengthening support
- Thinning-looking hair
How to Use
Apply to the scalp daily, section by section, and massage in. Do not rinse. Can be used on damp or dry scalp. Style as normal.
Key Ingredients
Amino acids draw moisture to the skin (humectant function), replenish the natural moisturizing factors found in healthy skin cells, and provide the raw materials for collagen and elastin synthesis. In the skin's natural state, free amino acids make up a significant portion of the NMF complex that keeps the stratum corneum soft and hydrated.
Draws moisture to the skin, helps maintain hydration, and reinforces the skin barrier.
Ingredients to Note
May be a concern for some skin types. Tap to learn more.
Full Ingredient List
About This Product
Kérastase Genesis Serum Fortifiant is the leave-in serum from the Genesis line — Kérastase's range specifically designed for hair weakened by mechanical and chemical stress rather than diffuse androgenetic hair loss. The formula is applied directly to the scalp and works along two complementary pathways: strengthening the hair fibre from within the scalp environment, and supporting the scalp surface to create a healthier foundation for hair growth. The Genesis line was developed in response to the concept of hairfall due to breakage — a meaningful but underaddressed distinction from male-pattern or hormonal hair thinning. The serum format is lightweight and leave-in, making it practical for daily use without changing the hair's feel or requiring a wash-out step.