I’ve experimented with numerous products for fragile, damaged hair—this serum truly delivers results.

      I've always been fortunate to have thick hair, which meant I never thought about incorporating scalp oil or serum into my haircare routine. While I've occasionally complained about the time it takes to wash and dry my hair or how sore my arm gets from using a straightener, I recognize how lucky I am. That was until a few months back when I was styling my hair into a ponytail and noticed significant thinning and breakage at the front of my head.

      I counted about five areas with sparse hair and several shorter strands that had evidently broken over time. I panicked about wearing an updo or a slicked-back bun, convinced it would be too noticeable. Of course, none of my friends or family noticed, but I was already deep into research for the best shampoos, scalp oils, hair supplements, and more to help. I’m not particularly proud of it (especially as a beauty editor with access to some of the best hair experts), but I even turned to TikTok for recommendations. One hair serum kept appearing on my For You Page: the Kérastase Genesis Anti-Chute Fortifiant Serum, a viral product aimed at making hair look fuller and thicker.

      The before-and-after images convinced me to try it, and I can say I've been testing the serum for the past four weeks. It’s clear that you need to use it consistently for more than just a month to see significant change, but after only four weeks, I’m already impressed. The serum is formulated with edelweiss native cells, ginger root, and aminexil, designed to reduce hair loss by enhancing fiber resistance, resulting in stronger and more resilient hair. Additionally, it helps support the scalp’s natural barrier. Given that my main issues were breakage and thinning around my scalp, it felt like the ideal solution.

      I have to mention that it's extremely easy to use and has fit seamlessly into my daily beauty routine. The brand recommends applying three to four pipettes to damp or dry hair; however, I found that amount excessive, so I opted for one to two pipettes each evening. I applied it to my scalp before bedtime, massaged it in, and then styled my hair into a braid or low ponytail for sleep. I worried I'd wake up with greasy roots, but the product absorbs quickly and is genuinely unnoticeable the next day. It has a fresh, powdery scent, which I appreciated using between wash days. In fact, I haven’t even reached for a hair perfume since starting this.

      As you can see, there are already noticeable changes to my hair after just four weeks. I’ve observed significantly less shedding, and my roots appear fuller and more voluminous. While there hasn’t been a dramatic regrowth yet, it’s still early, and I remain hopeful for the future. There are numerous scalp serums available for thinning hair, but this is the only one I’ve tried that has made such a visible impact in a short time. Moreover, it’s the one serum I found easy to incorporate into my routine due to its lightweight, non-greasy formula. With these types of products, consistency is crucial, so finding one that I can easily apply before bed (and doesn’t necessitate daily washing) is a real advantage. Plus, the scent is absolutely delightful. If Kérastase ever released a perfume in this fragrance, I would buy it in bulk.

      **Pros of Kérastase Genesis Anti-Chute Fortifiant Serum:**

      - Easy to apply

      - Incredible scent

      - Does not leave hair greasy

      - Enhances a thicker, fuller appearance

      - Supports the scalp’s natural barrier

      **Cons:**

      - I found the recommended application a bit heavy

      - Requires consistent use to see results

      **Similar Products:**

      - **Living Proof Scalp Care Density Serum:** A lightweight, leave-in treatment made with pea sprout extract, phytic acid, and turmeric for scalp stimulation.

      - **Grow Gorgeous Hair Density Serum Intense:** A travel-friendly mini serum that provides a month’s worth of treatments.

      - **Redken Acidic Grow Full System Hair Serum:** A spray application for a hydrated, balanced scalp, suitable for damp hair.

      **Why Trust Us:** At Who What Wear UK, we understand that beauty isn’t one-size-fits-all. Our editors have tested countless products—spanning skincare, makeup, hair, and nails—over the years and collaborate closely with trusted experts, including dermatologists and industry insiders, to ensure our guides are well-researched, inclusive, and relevant. We prioritize formulas that deliver measurable results, whether they are affordable staples or luxury investments. Our product selection is grounded in effectiveness, ingredient knowledge, and our genuine recommendations.

      Explore More: Hair Health