I've Tried So Many Products for Thin, Broken Hair—This Serum Really Works
After spotting this fortifying hair serum all over my feed, I had to put it to the test.
I've always been blessed with thick hair, which means I've never even considered adding a scalp oil or scalp serum into my haircare routine. Sure, I've moaned about it at times, complaining about how long it takes to wash and dry or how much my arm hurts after using my hair straightener, but really, I know how lucky I am. Well, that was the case until about a few months ago, when I was styling my hair into a ponytail and noticed it was seriously thinning and breaking around the front of my head.
I think I counted about five patches of sparse hair and lots of shorter tufts that had clearly broken over time, and suddenly panicked about wearing an updo or slicked-back bun, as I convinced myself it was too noticeable. Of course, none of my friends and family could even tell, but I was already too busy researching the best shampoos, scalp oils, hair supplements and more to try and help the situation. I'm not proud of it (I am, after all, a beauty editor with access to some of the top hair experts in the country), but I even turned to TikTok to see what other people recommended.
There was one hair serum that kept cropping up on my FYP. Of course, I'm talking about the Kérastase Genesis Anti-Chute Fortifiant Serum, the viral product designed to make your hair appear fuller and thicker.
The before-and-afters were enough to convince me to give it a go, and it's safe to say I've been putting the serum through its paces over the past four weeks.
It goes without saying that you'll need to use it consistently for a lot longer than a month to see a real difference, but after just four weeks, I'm already sold.
Formulated with edelweiss native cells, ginger root and aminexil, the nourishing hair serum is designed to reduce hair loss by improving fibre resistance, making your hair stronger and more resilient. Not only that, but it also supports the scalp's natural barrier. Seeing as my two main issues were breakage and thinning hair around my scalp, it seemed like the perfect product.
I have to say, it's incredibly simple to use, and it has been easy to slot into my daily beauty routine. The brand advises applying three to four pipettes on damp or dry hair; however, I personally found this a little too much product, and instead used around one to two pipettes per evening. I applied it to my scalp before bed, massaged it in, then styled my hair into a plait or low ponytail to sleep. I was worried I would wake up with greasy roots, but this product sinks in quickly and is genuinely undetectable the next day. It smells fresh and powdery, too, so I actually loved using this in between wash days. In fact, I've not even reached for a hair perfume since using this.
BEFORE
AFTER
As you can see, after just four weeks, there are already some small changes to my hair. I've noticed it shedding a lot less, and the roots already look fuller and more voluminous. Whilst there's no major hair regrowth, it's early days, and I have high hopes for the future. I know there are plenty of scalp serums out there designed for broken, thinning hair, but this is the only one I've used that has made such a noticeable impact in such a short amount of time. Not only that, but it's the one serum that I've found easy to slot into my routine thanks to the lightweight, non-greasy formula. When it comes to these kinds of products, consistency is key, so finding something I can easily apply before bed (and doesn't require me to wash my hair every single day) is a game-changer. Plus, the smell alone is to die for. Seriously, if Kérastase brought out a perfume in this scent, I'd be buying it in bulk.
Shop Kérastase Genesis Anti-Chute Fortifiant Serum
Pros
- Easy to apply
- Smells incredible
- Doesn't leave hair looking greasy
- Promotes a thicker, fuller appearance
- Boosts the scalp's natural barrier
Cons
- I found the recommended application a little too heavy
- Have to use consistently in order to see results
Shop More Hair Growth Serums
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A mini serum that offers a month worth of treatments and is great for taking on the go.
It might be pricey, but this skincare-inspired formula hydrates the scalp to create the optimum environment for hair growth.
If you prefer a spray, Redken has you covered. Apply to damp hair for a hydrated, balanced scalp.
Why Trust Us
At Who What Wear UK, we know that beauty isn’t one-size-fits-all. Our editors have tested thousands of products, including skincare, makeup, hair and nails, over the years and work closely with trusted experts—dermatologists, make-up artists and leading industry insiders—to ensure every guide is well-researched, inclusive and relevant to you.
We focus on formulas that deliver, whether they’re affordable favourites or luxury investments. Our product selection is based on tangible results, ingredient know-how and what we’d truly recommend to a friend.
