Garnier Fructis Keratin Sleek & Stay Serum

I’ve been using the Keratin Sleek & Stay Serum from Garnier Fructis, and it does a straightforward job without fuss. The serum feels lightweight and smooth, easy to apply to damp hair before styling or on dry hair to tame flyaways. A small amount goes a long way — I rub a tiny drop between my palms and work it through the mid‑lengths to ends. It absorbs quickly and doesn’t make my hair greasy or heavy. Once applied, my hair looks smoother and less frizzy, especially on humid days or after blow‑drying. It doesn’t weigh hair down and helps keep stray hairs under control. I don’t notice a dramatic transformation, but for everyday manageability, it’s effective enough. The scent is mild and pleasant, matching the rest of the Keratin Sleek range, and doesn’t linger too strongly. It plays well with heat styling — I use it before blow‑drying or straightening and don’t get any stiffness or build‑up. In short, this is a simple anti‑frizz serum that does what it claims. It’s easy to use, lightweight, and helps keep my hair looking smoother between washes. I’m happy with it and would use it again.

This serum is a game changer for at home sleek and straight hair. I have very curly, thick, frizzy hair and no matter what I have tried it always frizzes after a day if I straighten - a hazard of Queensland humidity. I used this after using the other products in the range to wash and condition. It is important to make sure you add it section by section, and not too much. The heat activation means you have to blow dry and flat iron to get the best results but it is worth it. My hair stayed frizz free and straight for a week which is not standard for me. I was able to brush it and it didn't produce static which again is unusual. I did try to use when I left my hair curly and it did also reduce frizz but this is best for straightened hair. This will remain a part of my routine when I straighten and the value is brilliant compared to similar products.

The final step, Garnier Fructis Keratin Sleek & Stay Serum, locks everything in beautifully. It instantly smooths flyaways and adds a glossy, polished finish without feeling greasy. A small amount goes a long way, and it helps keep my hair sleek and frizz-free throughout the day. My strands feel softer, look shinier, and stay smooth even in humidity. It’s the perfect lightweight finishing touch to complete the routine. My main criticism is that the smell is a little unpleasant, however it does not last. The product works well when used as recommended. It lasts up to 10 washes so best used fortnightly.

This was the product I reached for the least in the range. It’s well‑made, lightweight, and comes in a nice, practical size, but it’s not something I’d use on an everyday basis because I rarely style my hair or apply heat. I feel a bit unfit to judge it fully, given my own routine and circumstances, as someone who doesn’t need heat protection often. For people who style regularly, it would likely play a much more meaningful role in their lineup, but for my low‑maintenance approach, it didn’t become an essential step.

What an absolutely amazing product! I’ve used it countless times, and each time I’m more impressed than the last. In fact, it’s been so effective that I’ve ended up throwing away all my other products that were supposed to do the same thing. Even on days when I don’t straighten my hair, this product still leaves my hair feeling incredibly silky smooth and looking healthy. It not only feels great to the touch, but it also has this lovely fragrance that lingers, making my hair smell wonderful throughout the day. I’ve noticed a significant reduction in frizz, and it really tames my hair without weighing it down. Whether I’m going for a sleek, straight look or just letting my natural texture shine through, this product works like a charm every time. It’s definitely become a staple in my routine

At first, I wasn’t sure if this serum would actually make a difference, but I have to say I’m genuinely impressed. I use just a small amount on damp hair before blow-drying or styling, and it completely transforms the texture. My hair feels so soft and looks incredibly smooth from root to tip, and the frizz that usually drives me crazy is instantly tamed. Even on humid days, my hair stays sleek, shiny, and manageable, which is something I rarely experience with other products. I also love that it’s super lightweights, so it doesn’t weigh my hair down or leave it greasy, and the scent is subtle and fresh—definitely not overpowering. I’ve been using it consistently for a few weeks now, and I’ve noticed that my hair looks healthier, feels stronger, and is much easier to style. Honestly, this serum has become a staple in my haircare routine, and I can’t imagine going a day without it. If you struggle with frizz or want your hair to look smooth and polished, this is hands down worth trying!

The Garnier Fructis Keratin Sleek Stay Serum from Garnier is the magic product in the range for me. It is what really elevates the blow dry and gives that smoother, sleeker finish. There is a bit of an art to applying it. The first time I used it, I applied too much and it felt slightly sticky. What worked best was combing my hair when it was damp, emulsifying a small amount in my hands, then scrunching it mainly through the ends. I used whatever was left on my hands lightly closer to the scalp to avoid overloading the roots. Once I got the technique right, it was very effective at smoothing and helped control frizz without weighing my hair down.

I've been trialling the Garnier Keratin Sleek heat-activated serum, along with the shampoo, conditioner and hair mask from the same range. All products have a fresh and floral scent, which leaves me feeling more alert after my morning shower. The serum smoothes through your hair without weighing it down, to protect against damage from high temperatures. As a four step process, this has left my hair feeling hydrated, smooth, and much easier to tame with or without heat styling. And I enjoy the confidence that my heat tools aren't going to cause too much damage (although I still turn them down to be safe). If you, like me, sometimes forget to take care of your hair, this product will make it so much easier!

What a product ! I received this as a treat product review. I have tried the shampoo,conditioner and mask,i followed all the steps and for the first time ,i was compimented on leaving my hair down ,as i never do because of all the frizz ,this helped so much. It was not greasy ,even when i put too much in my hair ,it always looked healthier. Yes i would recommend a product if it worked and this seems to tick all the boxes. Well done garnier fructis sleek. The number system made it so easy to follow,more on the pricey side ,but its not over the top expensive compared to other products ive used and some not giving thecresults promised

This review is for all four products in the keratin sleek range – shampoo, conditioner, hair mask and serum. I found this product to be relatively effective at delivering ‘sleeker’ hair. The product is pleasant smelling and I found that the conditioner washes well. I did find that my hair required washing more frequently with these products. I also would prefer fewer steps in my hair care routine. Waiting out both the conditioner and the hair mask added considerable time to my hair care routine. I found after the initial use I found that my hair had more frizz than normal, however with repeated use over a few weeks, the frizz has decreased and it is ‘sleeker’. Overall relatively happy with this product, however will need to weigh up the additional monetary and time cost if I were to replace my regular hair care products.

This Garnier Fructis Keratin Sleek & Stay Serum is amazing! A little goes a long way and has helped tame the frizz. I try and use this once a week for the best results in addition to using the matching shampoo and conditioner. My hair feels so much better and is very smooth without any frizz so I'm very happy with the results and love this range. It makes such a difference finding something that actually works well and make hair care so simple I love it and will definitely be purchasing more from this range

This serum definitely smooths flyaways and adds instant shine. A small amount goes a long way, and it gives a very polished, sleek finish once styled. It works well to tame frizz and make hair look more controlled. However, layered with the full routine, it felt a touch heavier than I prefer and reduced that soft, airy movement I love. It’s effective for smoothing, but I’d personally use a lighter hand or pair it with a more lightweight wash routine. But I did like this one and I probably will use this one again.

This serum might be effective for taming frizz and controlling flyaways for others but in my experience it did not really provide that effect. I also found the scent chemically and overpowering, was not a fan of this and often used a very small amount of product to coat my hair with. I usually end up with frizz afterwards. Either air drying or blow drying. However after blow drying AND using a hair straightener I found my hair was usually sleeker and more manageable but I’ve found this experience alone without using any added serum products to match the same affect so not sure the serum is actually doing the job.

So I recently got Garnier Fructis Keratin Sleek & Stay Serum to see if it could help with my frizz, and honestly, it’s pretty good. The serum is lightweight and silky, so it doesn’t make my hair feel greasy or heavy. Mostly, when you use oil, the scary part is the next day your hair is so oily, and you have to tie it up, but it did a good job. I was impressed. I usually just put a few drops on damp hair after a shower and before styling, and it really helps smooth out flyaways and tame frizz. My hair ends up looking sleeker, shinier. I even use a tiny bit on dry hair for touch-ups, and it works nicely without feeling sticky. It’s lightweight, easy to use, and super affordable. You can grab it at any supermarket. Perfect for a quick frizz fix anytime.

I have been using this garnier fructis keratin sleep and stay heat activated hair serum and I am really impressed. You apply it before styling and once you use heat it really gets to work. It left my hair feeling super smooth and noticeably less frizzy, even in humid weather. What I love most is that the effect ls lasted up to 5 washes, which made it feel worth the price and worth buying. My hair looked shiner, felt softer, and was way easier to manage. It just worked really well and helped my hair.

Can’t express how much I was excited to try Keratin Sleek & Stay Serum and it didn’t disappoint a bit. Initially I didn’t expect any outstanding results from it as I used to buy a similar product from a high end brand but can say with a lot of certainty that Garnier just made a supermarket product with a salon quality! My hair is super dry and fine and lots of products make them feel oily and weight them down but not this product. This serum makes my hair smoother, shinier and overall look healthier. As all Garnier products of this range serum has divine smell. It’s just a pleasure to use this product. My step daughter has completely different hair texture and I struggle to brush her hair as they tangle so much but I noticed that it’s so much easier to manage them if I spray this serum on her damp hair when use hairdryer. Huge win in our house !

Loved using this product after using the shampoo, conditioner and mask from the range. I used a few pumps of this serum on damp hair and worked it into my mid sections and lengths mainly then heat styled. My hair felt beautifully soft and sleek. My hair is usually frizzy, wavy and puffy after washing and usually always need to heat style it to make it look decent but after trying this range there was a noticeable difference. Would definetly repurchase again and hope after some prolonged regular use the product improves my hair even more

I feel very lucky to have trialled the Garnier Fructis Keratin Sleek & Stay Serum and it has quickly become part of my routine. The pump packaging is super convenient and makes it easy to control the amount you use. The consistency is lightweight and smooth, so it glides through the ends without weighing them down. It has a beautiful, light fragrance that’s subtle but fresh. You only need a tiny amount, so it lasts well. I’ve definitely seen a visibly noticeable reduction in frizz and my hair looks shinier and more polished without feeling greasy.

I’m quite picky with hair serums because so many leave my hair feeling oily, but this one gets it right. You only need a tiny amount, and it spreads easily through the mid-lengths and ends. It instantly smooths flyaways and adds a really natural shine without looking greasy. I love using it after blow-drying or straightening to give that polished, finished look. It also helps keep frizz under control throughout the day, which is important for me in humid conditions. My hair feels silky, lightweight and smooth, not stiff or sticky. It’s now my go-to finishing step for sleek styles.

This little bottle ro2ght here carries the whole team! As someone with thick curly hair that is frizzy/dry and somewhat unmanageable without using heat styling, THIS IS A HG!! I have used so many serums/sprays/leave-ins etc and none have performed like this, unless I go to my hairdresser, even then..... I was using a well known brand in a chrome bottle and quite a number of other expensive salon serums, no more! I use this with my dyson and even my cloud 9 and even in humidity (which is the biggest killer for me, the puff) my hair stays relatively smooth and straight compared to what it did. Some weather you can't help, but overall this is an absolute must have on my shelf now!!