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✨ Unlock your hair’s ultimate silky glow — because smooth waits for no one!
GK HAIR The Best Smoothing Keratin Treatment is a professional-grade, cruelty-free formula designed to temporarily straighten and smooth all hair types. Infused with natural seed oils and anti-aging keratin protein, it deeply conditions, reduces frizz, and enhances shine for up to 5 months, delivering salon-quality results from the comfort of home.




































| ASIN | B006P1EJMS |
| Best Sellers Rank | #28,051 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #10 in Chemical Hair Straighteners |
| Brand | GK HAIR |
| Brand Name | GK HAIR |
| Customer Reviews | 4.0 out of 5 stars 1,981 Reviews |
| Global Trade Identification Number | 00815401014019 |
| Hair Type | All, Wavy, Curly, Afro American |
| Item Form | Liquid |
| Item Weight | 13.6 ounces |
| Manufacturer | GK HAIR |
| Manufacturer Part Number | GKH-JT-420-10 |
| Material Features | Cruelty Free |
| Model Number | GKH-JT-420-10 |
| Number of Items | 1 |
| Product Benefits | Prevents breakage, Reduces styling time, Smooths and straightens hair, No wait time for shampooing |
| Scent | Floral Blossom |
| Scent Name | Floral Blossom |
| Set Name | GK HAIR Keratin Treatment |
| Special Ingredients | Keratin |
| UPC | 815401014019 |
| Unit Count | 10.1 Fluid Ounces |
A**A
It WORKS! But it smells so horrible after the heat styling
Okay, so far I am absolutely ENAMORED with this product!!!! So much less expensive than getting it professionally done. I’ve never done keratin before but I think I did a really good job! PLEASE WEAR GLOVES AND A HIGH LEVEL MASK WHILE USING THIS PRODUCT. Do NOT handle the treatment directly on your skin. Do not use this product after shaving, waxing or exfoliating your facial skin. All I wanted was to not have to worry about my hair for work, the hospital, and clinicals as a healthcare professional and student. As a model, this hopefully makes my life easier and I should still be able to have my hair curled for shoots. But I haven’t finished working with it yet… I did some of the steps out of order by accident. Here is your comprehensive guide of how I did this, and the honest truth about it so far. So I double-shampooed my hair with a clarifying shampoo, and then put the product through all of my wet hair for one hour. After doing this, I left it on for an hour. Then I ended up blowing my hair dry with a round brush (two different types of hair dryers) and then went over it with two different straightening irons. This is where I made a mistake - you are supposed to RINSE this product out after an hour and use a deep conditioner for 5 minutes (see step 5). I mistakenly left it on for about 24 hours. Do not leave it on for that long. The fumes aren’t good for you - you should be wearing a high level K/N95 or elastomeric mask while working with these chemicals. (Google Brad Mondo Keratin - you’ll see). The actual product doesn’t smell bad - it’s actually a cream and it can splatter a little. But it is easy to spread on your hair and cover each strand. One 3.4 oz bottle was more than enough for my hair, even though I have long, dense hair. As you can see in the photo, my hair has no frizz, and it’s so shiny after rinsing the product and re-drying with a blowdryer and then a straightening iron. CONS: Since I accidentally straightened my hair without rinsing the product, there was a lot of residual gunk on my hairbrushes and combs. There was a strong smell that remained in my hair after that. After rinsing out the product, 24 hours later, my hair smells AWFUL. I did not add a deep conditioner, and it is absolutely disgusting to smell it right now, even though it is very smooth. I expect that washing my hair and deep conditioning it tomorrow should get rid of the odor. PROS: The frizz is gone, especially the ones with my baby hair around my face. My hair is shiny and straight. It’s somewhat soft too. When I went to rinse out the product, my hair did not curl up like it usually does, so the product really did break the bonds for my waves. My only goal was to get rid of the frizz for my professional life in healthcare and studying. This product really worked! Also, here is how to use the product and do it yourself the right way. Good luck! The steps from the website are listed below: 1. Wash hair twice with the pH+ Shampoo, leave the shampoo on hair for at least 3 minutes during each application. Avoid massaging your scalp. 2. Section the hair starting at the nape of the neck and begin to apply ½-inches away from the scalp using the application brush to apply “The Best” on each ½-inch sections of hair while massaging into the hair with your fingers. The hair should be saturated with The Best. DO NOT APPLY ON THE SCALP. 4. Leave product in hair for 40-60 minutes. (60 minutes for maximum smoothing result) Cover the hair with a plastic cap. 5. Rinse product out of hair with warm water. For color-treated hair: apply GK Color Protection Moisturizing Shampoo and rinse. Apply Deep Conditioner for 5 minutes, rinse thoroughly. 6. Blow-dry the hair straight on high heat with a round brush using sufficient tension to smooth the hair until 100% dry. 7. Section the hair and flat iron with GK Hair Titanium Flat iron at 400 degrees. If the hair is overprocessed, flat-iron at 375 degrees, lower the temperature further if the hair is very weak and damaged; especially towards the ends of the hair. Pass the flat iron about 2-4 times in each section. 8. Clients are free to wash their hair at any time after the treatment, using GK Hair Shampoos and Conditioners fortified with Juvexin to maintain the results of the treatment.
D**E
IT WORKS!
I am Black with a mixture of 3C/4A hair. Some of you are trying to see how this works on black hair so here is a review for my people. IYKYK... For the record, I don't really believe in curly hair types because my hair pattern becomes more kinky when dry and is curly/coily when properly moisturized. I'm mentioning it here as a reference point for the girlies. Again, IYKYK. I like this product. I've tried plenty of things to help my super dry natural hair and NOTHING really helped. My hair continued to remain dry. I know natural hair needs moisture to cooperate & I KNOW how manageable my hair is when it's properly moistured (my first henna treatment showed me that years ago). Well the instructions were simple and straightforward. I didn't notice any bad smell like some other reviewers and I couldn't have cared less what it smelled like if it worked. It was VERY easy to use so the girlies who struggled, must be struggling in life because a relaxer at home coloring is way more complicated than this. I purchased the revlon blower dryer (Dr. Curly or tangle something) brush to assist with blow drying process which made everything SUPER easy. I also combined it with an olaplex treatment but I don't feel if affected my results at all. Truthfully, what really helped, was when I washed my hair a week later. I used the Aphoghee shampoo & moisture balancing conditioner. I didn't do another olaplex treatment, just the Aphoghee and my curls were Chris Brown Poppin! My natural hair was super manageable and my entire head was 4C for reference. I know my hair is thoroughly moisturized and behaving when I don't have to drown it in product. I can spray it with some water, a little leave in (my hair is fine so I do mean a little) and a bit of Aussie curl gel (the only gel I use because it's mositurizing and mixes well with ALL my hair products. You ladies know ecostyler doesn't mesh with everything, but the Aussie Moist gel does! The product does appear to loosen your curls a bit, but I believe it just really moisturizes the hair more than a looser curl pattern. Again, I think really moisturized hair makes a difference in your curl pattern. I only noticed my new growth because it was super frizzy and very tightly curled compared to the the keratin treated hair. I did my treatment early February and it is mid-April. I noticed about 2-2.5" of new growth and the treatment is still going strong. I'm unsure if it permanently straightens hair after repeated treatments but my next application will probably be over the untreated hair first. This is not like a relaxer/texturizer. My hair is still very curly; it truly is more just manageable than before. However, eventually, I will try to see if it straightens hair with repeated applications or it only lasts so many treatments before it reverts back to my natural hair. As long as the treated hair cooperates, I don't see an immediate needs to reapply the treatment of the pre-treated section. I apologize that this review is long, but I wanted to give as much details from my perspective because I know I didn't have much to work with from a Black woman's perspective when I was unsure about ordering this.
D**A
Not the same formula
I've used this product twice before and each time my hair came out beautifully. I've always followed the instructions and have never had any problems. This time when I used it I noticed the smell was strong and reminiscent of a lye perm but I still used it anyway. I followed the instructions again and before I was midway through the application I noticed my scalp was burning. I hurried and applied the rest of the product not putting it close to my scalp as instructed and combing the product through to my ends also as instructed. When I washed my hair and blow dried it out I immediately recognized that my scalp was burned. I'm a nurse and I know a scalp burn. My hair was very flat, too straight and had no life at all. This was very different than before. My thick, long and growing hair was DEAD. I was really upset. When I went to my stylist she had to cut my hair from the large amount of breakage and apply a deep conditioner to repair my damaged hair. My edges are broken off badly especially in the back. Instead of getting my normal blow out now I have to wear my hair in curls to hide the thinning areas. I spent over $200 for a correction and my hair is still ultra dry. Like I said this is a different chemical formula, way too strong
T**O
Tame the locks
This product has no bad smell and zero fumes. It’s easy to use and gives a great result. Directions are clear and it can be applied at home without any help. I’ve been using it every 8-12 weeks for the past 7ish years now and it’s one of the hair products I don’t want to be without. The downside is that it doesn’t last long enough and starts to loose some effect after a couple of shampoos (use cool water and sulfate-free shampoo to last longer). The cost is also quite expensive for what it is. Still, I think it’s the best keratin product on the market for home use and it doesn’t damage my hair, so while it’s not perfect it still ranks at the top of my list. For someone like me with kinky, frizzy, unruly hair, this formula works very well. I leave it on for an hour and rinse clean before ironing/styling.
K**H
Great results, make sure you prep
Bought this product because I heard keratin treatments loosen curl patterns and aid in frizz control. I have the whole range of type 4 hair. A b c. All over. I have struggled with frizz and manageability for years, which caused me to wear my hair in braids for the majority of the year. I wanted to start to wear my curls out more and be able to get past shoulder length. This product definitely helped with everything I mentioned! My wash days are MUCH shorter, detangling is a breeze, and my hair feels soft and manageable. I did suffer from some heat damage around the edges of my hair, but I did have a leave out sew in not too long ago, and I might have went over board on the heat with the more fragile parts of my hair. I will say that when applying the treatment, make sure your hair is detangled so you can quickly and thoroughly get it on all the strands. It took me a long time to apply, resulting in one side of my head not being as treated as the other. Also, I have washed my hair since doing the treatment and there is a lingering smell. Nothing absolutely disgusting or anything, but it lingers. That is the reason for 4 stars. Absolutely loved the product and will purchase again!!
C**S
Love this Product
GK COCO smells delicious and gentle on my hair. I should have purchased a larger bottle, but it's pricey unfortunately.....I need more.
A**I
Good product, just don't buy it from the manufacturer's website
Edit: Do your research about the ingredients in this product before deciding to use it, as you would with any other beauty product. Recent research has been released regarding the use of glyoxylic acid based keratin treatments. Original review: _------------------------------_ DO NOT BUY FROM MANUFACTURERS WEBSITE. I pretty much never make product reviews for anything but I decided to make an exception to warn people about this. I've purchased this product twice, once from Amazon, once from the GK hair website. The one from Amazon arrived boxed & sealed properly. I was happy with the product so I decided to buy it direct from the manufacturer's website. The packaging it came in was as far from tamper proof as you can get. There was no box, and the mailer was basically open so that anyone could slip their hand in. The product seal was already removed when it arrived, so needless to say I did not use it. Because of their extreme return policy (you have to notify them within 2 days of receiving it... I don't even check my mail that often) I could not return it so now I am out 65$. The product itself is good, I am happy with it. When I like a product, I try to buy direct from the manufacturer so they don't get hit with fees from Amazon. Also helps with avoiding counterfeits. Do not do that with this product, it's a mistake. Just make sure you buy from the actual GK hair store on Amazon so the product is held to Amazon's packaging and return standards, and not the incredibly poor policy of the original company. As far as the actual product goes, it reduced my curls to 3a/b when they were 3b/c before. It is not a drastic reduction in curl but you will definitely be able to tell the difference between regrowth and treated hair. Make sure you also get the high ph shampoo. For this type of keratin treatment opening up the cuticle with a high ph cleansing shampoo greatly improves the result of the treatment (according to the only published study on it anyway..).
K**R
Awesome results!
I’m sure customer results vary, but I used this on my 94 year-old mother’s hair and it was fantastic! I have been getting salon treatments for decades, but I’m switching to DIY and hope for similar success. Of note: I used generous amounts of product (about 80% of the bottle), left the product on for 40 minutes under a cap, and used a blow-dryer to heat it for about 10min under the cap towards the end. I then rinsed with COOL water, and finished with blow-dry and flat iron as instructed. See pics before and after!
A**Y
Broken seal
Every time I buy this I wonder why the seal is always broken 💔
M**E
It’s not bad! If you want to reduce curls and not erase them.
I did a bit a research while buying and have to say the product isn’t nearly as bad as you think. It largely depends on what you are after with your results. If you want bone straight hair then this product isn’t for you. If you have very kinky coily hair or hair prone to frizz then this product will reduce it, not completely eliminate it. The normal GK range is ideal because the keratin formula is stronger. However if you have colour treated your 4c or 4b hair you probably shouldn’t use stronger chemicals for it. The coco line of products are meant to be a gentler and more hydrating formula. I have posted a before and after photo to show how much the product reduced my frizz. I had flat-ironed my hair in both of these pictures. The GK results smoothed my hair out significantly but didn’t completely erase my texture. For me that’s fine because my hair is a lot more manageable. Getting bone straight hair from this product is achievable if your hair is more fine. My hair is thicker and more coarse so the results will not be the same. Watch a few YouTube videos of people with your hair type try the product because that will show you what to expect.
L**.
Very efficient
Excellent product
L**E
Le meilleur!!
Une valeur sûre. Cheveux brillant et en santé ?
I**N
Very happy with this purchase
It is one of the best products I have ever used!
Trustpilot
1 month ago
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