This Lightweight Scalp Serum Targets Grays While Supporting Hair Growth—Here Are My Thoughts After Two Months

I’m 26, but I’ve already started taking hair aging seriously. After years of balayage and regularly using hot tools, my strands need all the help they can get. I use a host of products, including a clarifying shampoo and weekly hair mask, plus silk pillowcases to minimize tugging while I sleep. And, of course, I use a scalp serum to support hair growth.Most serums I’ve tried focus on one thing: reducing hair shedding by creating a healthier environment for growth. But K18’s latest innovation, FutureIQ Hair Longevity Serum, targets three major signs of hair aging: graying, shedding, and scalp aging. Rather than waiting for these concerns to show up, the formula is designed to address them proactively, which is exactly what I’m looking for in my mid-20s.The longevity conversation has been popping up in every facet of the beauty world, and K18 is no stranger to combining haircare and innovation. Just look at its groundbreaking Leave-In Molecular Repair Hair Mask, which strengthens damaged strands. Now, FutureIQ is taking that same science-forward approach to the scalp.The FutureIQ Serum features K18’s signature MultiVital technology, which combines biomimetic peptides, a root anchoring complex, and an antioxidant system. Together, these ingredients help strengthen the hair at the root, support melanin production and transport (aka the processes involved in graying), and protect the scalp from oxidative stress.I’ve been applying FutureIQ daily for the past couple months, yes, to fend off grays, but also to the areas where I’ve noticed some thinning from my constant high-tension slicked ponytails—above my temples, along my part, and at the back of my head. I’ve also paired it with a gentle Tangle Teezer brush to minimize that dreaded pulling and tugging during styling.Jasmine Hyman for CosmopolitanUnlike many scalp serums, this doesn’t make my hair look or feel greasy after (I’m someone who gets oily after just one wash day). I can use it on clean hair and it simply dries, and no one is able to tell that K18’s formula is working overtime on my scalp.Obviously, two months of use isn’t long enough to tell whether I’ve actually delayed graying, especially since I don’t have any grays to begin with. But I have noticed less hair shedding. I’ve always been alarmed by how much hair I’ve seen come out when I comb or wash it, so fewer strands in my brush and in the drain have been a welcome change.Overall, this has been a great addition to my haircare regimen, and while I can’t see the longevity claims in action just yet, I can rest easy knowing I’m doing as much as possible for my scalp health and to deter graying for as long as possible.More K18 FavoritesK18 Heatbounce Conditioning Heat ProtectantK18 PEPTIDE PREP™ Detox ShampooWhy Trust Cosmopolitan?Jasmine Hyman is the assistant beauty editor at Cosmopolitan who covers all things hair, makeup, skin, and more. For this story, she tested K18’s latest launch for two months to give her full review based on ease of use, feel, results, and more.Jasmine Hyman is the Assistant Beauty Editor at Cosmopolitan, where she writes about the latest beauty trends and must-have products. Her most prized beauty possessions are a meticulous skincare routine and salon blowouts. You’ll also likely find her in bed reading a good book or endlessly scrolling TikTok (spoiler: it’s usually the latter) while listening to Harry Styles’ entire discography on repeat. Follow her on Insta to be inundated with pictures of her meals.