Kerastase “Hair Loss” Shampoo: What Genesis Actually Treats
People searching for “Kerastase hair loss shampoo” are almost always looking for the brand’s Genesis line — and the most important thing a dermatologist can tell you about it is something the brand itself says plainly: Genesis is not a hair loss product. It’s formulated for hair fall caused by breakage, which is a genuinely different problem from hair loss at the follicle. Understanding that distinction will save you money and disappointment either way.
Hair fall vs. hair loss: the distinction that actually matters
Worth knowing: Hair fall from breakage means the hair shaft is snapping partway along its length, usually from friction, dryness, or chemical damage — the strand comes off, but the follicle and root are unaffected. Hair loss (as in androgenetic alopecia) happens at the follicle itself, where hairs miniaturize and eventually stop growing back. These look similar in the shower drain, but they need completely different solutions. Genesis is built for the first problem, not the second — our guide to does shampoo cause hair loss covers this distinction in more detail.
What’s in the formula
Kerastase Genesis shampoo is built around a few notable ingredients:
- Aminexil — a proprietary ingredient used across several L’Oréal-owned brands, generally marketed for supporting scalp and follicle health. It’s a branded, patented ingredient rather than a widely independently studied compound, so treat brand claims about it with the same hedged expectations you’d apply to any single proprietary ingredient.
- Edelweiss native cells and ginger root extract — positioned for scalp protection and fiber strengthening; plausible supporting ingredients rather than proven hair-growth drivers on their own.
- A sulfate-based cleanser (sodium laureth sulfate) in the shampoo itself, formulated to be gentle enough for frequent use on fine or weakened hair, alongside a lightweight, largely fragrance-driven scent profile.
Who this suits
A reasonable choice if your concern is genuinely about hair breakage — strands snapping, visible shorter “fly-away” hairs, or fragility after color or heat styling — rather than a widening part or receding hairline. It’s a poor match, and an expensive one, if what you’re actually noticing is progressive thinning at the scalp, which points toward pattern hair loss instead.
If it’s actually hair loss you’re dealing with
If your concern is a widening part, visible scalp, or a receding hairline rather than breakage, a fortifying shampoo like this one — however well-formulated — isn’t the right category of product. Our DHT-blocking shampoo guide explains what’s actually implicated in pattern hair loss and what has stronger evidence behind it, and a dermatologist visit can confirm which situation you’re actually in.
Frequently asked questions
Does Kerastase Genesis actually treat hair loss?
No -- the brand explicitly positions Genesis as an anti-hair-fall product for breakage, not a treatment for hair loss at the follicle (such as pattern hair loss). If you're experiencing thinning at the scalp rather than breakage along the strand, this isn't the right category of product.
What's the difference between hair fall and hair loss?
Hair fall from breakage means the strand is snapping partway along its length while the follicle stays healthy. Hair loss happens at the follicle itself, where hairs progressively miniaturize. They can look similar day to day but need different approaches.
What is Aminexil?
It's a proprietary ingredient used across several L'Oreal-owned haircare brands, generally marketed for scalp and follicle support. It's a patented, branded ingredient rather than one with a large body of independent, third-party research, so it's reasonable to treat brand claims about it with some hedging.