CHI Keratin K-Trix 5 Smoothing Treatment, Hair Serum For Creating Smooth, Frizz-Free Styles That Last, Sulfate, Paraben, & Cruelty-Free, 3.92 Oz
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Extended holiday returns
Returnable until Jan 31, 2026 Learn more
Returnable until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
Only 4 left in stock, order soon!
Arrives
Nov 7 – Nov 11
Recently Viewed
Style: Smoothing Treatment
Size: 3.92 Fl Oz (Pack of 1)
Features
- SERUM FOR SMOOTH HAIR: This thermally activated smoothing treatment combines with the heat of a styling iron to smooth the hair cuticle, lock in moisture & seal out humidity for soft, frizz free styles that last up to 5 days (based on shampooing daily).
- CHI KERATIN LINE: Pair use of this product with the CHI Keratin Reconstructing Shampoo and Conditioner for the ultimate hair-smoothing routine.
- CHI HAIR TREATMENTS: CHI's masques and treatments are luxuriously rich to add strength back to dry, damaged or overworked hair. They deeply nourish and repair hair with essential vitamins and antioxidants that improve hairs overall luster and appearance.
- HOW TO USE: Before blow drying, apply a small amount to hair and work through evenly. Blow dry hair and follow with the CHI Ceramic Hairstyling Iron.
- CHI: Founded by Farouk Shami, a hairdresser allergic to ammonia who sought to create the first ever ammonia-free hair color & has remained committed to crafting the finest ethical haircare. All CHI products are cruelty-free, paraben-free, & sulfate-free.
Description
Gently cleanses and rids hair and scalp of impurities while balancing oils and strengthening the hair. The invigorating and soothing benefits of tea tree oil and peppermint oil work together to balance scalp oils and maintain moisture levels. Brand Story CHI haircare and tools are manufactured by Farouk Systems a Houston based company.
Product Benefits: Maintains moisture levels.
Hair Type: Treatments
Material Type Free: Paraben Free
Scent: Tea Tree
Liquid Volume: 115 Milliliters
Is Discontinued By Manufacturer : No
Product Dimensions : 1.25 x 1.25 x 3.9 inches; 3.53 ounces
Item model number : CHIKT4
Batteries : 1 A batteries required.
UPC :
Manufacturer : Farouk Systems Inc
Best Sellers Rank: #9,290 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #23 in Hair Styling Serums
#23 in Hair Styling Serums:
Customer Reviews: 4.6 4.6 out of 5 stars 16,356 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Nov 7 – Nov 11
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: Silk Infusion
Size: 6 Fl Oz (Pack of 1)
The CHI Keratin Silk Infusion is a solid hair serum that delivers noticeable improvements in manageability and shine. It has a lightweight, silky texture that absorbs quickly without leaving hair greasy or weighed down. I’ve been using it on my dry, damaged ends after heat styling, and it definitely helps smooth frizz and adds a healthy-looking gloss. The keratin and silk proteins do provide some restorative benefits—my hair feels softer and looks healthier after consistent use. A little goes a long way, so the bottle lasts quite a while, which makes it good value for the price point. That said, it’s not quite as transformative as professional salon treatments or higher-end serums. While it improves the surface appearance and texture, it doesn’t deeply repair significant damage or provide the same long-lasting conditioning that you’d get from premium products like Olaplex or Kerastase. The shine is nice but fades by the end of the day, and severely damaged hair will need more intensive treatment. For everyday use and maintaining relatively healthy hair, this is an excellent affordable choice. Just don’t expect miracles if you’re dealing with seriously compromised or chemically treated hair. Rating: 4/5 stars - Reliable daily serum that punches above its price point, but can’t fully replace professional-grade products.
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Reviewed in the United States on October 11, 2025 by Becca
Style: Smoothing Treatment
Size: 3.92 Fl Oz (Pack of 1)
I am so impressed with the CHI Keratin K-Trix 5. After just one use, my hair felt incredibly smooth, soft, and much easier to manage. It really helps to lock in moisture and reduce frizz, leaving my hair looking shiny and healthy all day. I love that it protects my hair from heat styling too, which makes a huge difference in keeping it strong and damage-free. This product is definitely a must-have for anyone who wants salon-like results at home. Highly recommend!
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Reviewed in the United States on October 1, 2025 by Amanda Thalia Garcia Osoria
Style: Smoothing Treatment
Size: 3.92 Fl Oz (Pack of 1)
The CHI Keratin K-Trix 5 Smoothing Treatment works exactly as promised. It leaves my hair soft, smooth, and noticeably shinier, with a healthy look that lasts for days. It also tames frizz without weighing my hair down or making it greasy. I love that it protects against heat styling while repairing damage at the same time. My hair feels stronger and more manageable after each use, and a little goes a long way. If you’re looking for a salon-quality smoothing treatment you can use at home, this one is a winner.
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Reviewed in the United States on August 11, 2025 by Matt
Style: Silk Infusion
Size: 6 Fl Oz (Pack of 1)
I have looked high & low for a good, clear, silk-infused treatment for my hair, that doesn't stink. I have used the Bio-Silk formula, but my local stores haven't had it in-stock lately. I also tried the basic, red-lettered CHI Silk Infusion. I liked the product, but not the smell. I have asthma, so I have to be careful with hair products that are strongly or wrongly scented for me. Certain scents induce breathing issues. A couple of years ago, I used Regis Design Line Silk Drops. It was amazing and had a fresh, clean smell. Sadly, they changed the fragrance, and I could no longer use. A nightmare for me is the modern, heavy-bodied, perfumy scents that are all the rage now. The most popular seem to be infused with a musky, heavy, vanilla odor. I can handle most fresh, floral or fruity smells. That musky, vanilla scent is nauseating to me, not to mention takes my breath away! Vanilla is great for baking, but who wants their hair or perfume to smell like that! For those that are wondering, this CHI Keratin Silk Infusion smells a bit different than their red-capped/red-lettered formula. It has a lighter fragrance with a somewhat citrusy tone. It works great, as long as you don't use too much. It softens & helps detangle, adding a bit of moisture & shine. My hair is color-treated, so I thought this would work better, to help strengthen. The smell doesn't bother me either. I count that as a win/win! Was so happy to find it here on Amazon!
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Reviewed in the United States on September 15, 2023 by AmericanBulldogger
Style: Silk Infusion
Size: 6 Fl Oz (Pack of 1)
I usually use no Biosilk but I think they changed their ingredients because the last time I bought bio silk it was oiler then usual so I tried this instead and I like it much better as well as it smells better too
Reviewed in the United States on September 18, 2025 by Andrea karr