---
product_id: 1972194
title: "Large Set- Brazilian Keratin Hair Straightening Complex Long-Lasting Treatment with Argan Oil for Smooth, Professional Straightening Results (4 PC XL VALUE)"
brand: "keratin research"
price: "¥30771"
currency: JPY
in_stock: true
reviews_count: 13
category: "Keratin Research"
url: https://www.desertcart.jp/products/1972194-large-set-brazilian-keratin-hair-straightening-complex-long-lasting-treatment
store_origin: JP
region: Japan
---

# 4-6 months smoothness duration Sulfate-free, natural keratin & oils 300ml x4 bottles for lasting hydration Large Set- Brazilian Keratin Hair Straightening Complex Long-Lasting Treatment with Argan Oil for Smooth, Professional Straightening Results (4 PC XL VALUE)

**Brand:** keratin research
**Price:** ¥30771
**Availability:** ✅ In Stock

## Summary

> ✨ Unlock your sleekest, strongest hair yet — because your mornings deserve a glow-up! ✨

## Quick Answers

- **What is this?** Large Set- Brazilian Keratin Hair Straightening Complex Long-Lasting Treatment with Argan Oil for Smooth, Professional Straightening Results (4 PC XL VALUE) by keratin research
- **How much does it cost?** ¥30771 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/1972194-large-set-brazilian-keratin-hair-straightening-complex-long-lasting-treatment)

## Best For

- keratin research enthusiasts

## Why This Product

- Trusted keratin research brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Complete Care Kit:** Includes clarifying shampoo, moisturizing shampoo, conditioner, and straightening cream for a full hair transformation.
- • **Long-Lasting Smoothness:** Enjoy frizz-free, sleek hair for up to 6 months—wake up flawless every day.
- • **Powerful Natural Formula:** Infused with keratin, argan oil, and collagen amino acids to strengthen and repair all hair types.
- • **Salon-Quality Results at Home:** Achieve professional-grade straightening and smoothing without the salon price or wait.
- • **Effortless Application & Support:** Easy-to-follow instructions plus responsive customer support to ensure perfect results.

## Overview

This 4-bottle 300ml kit from Keratin Research delivers a sulfate-free Brazilian keratin treatment that straightens, smooths, and strengthens all hair types. Featuring a potent blend of keratin proteins, argan oil, and collagen amino acids, it offers professional-grade results at home with effects lasting 4-6 months. The set includes clarifying and moisturizing shampoos, conditioner, and straightening cream, designed for easy application and long-lasting frizz control.

## Description

desertcart.com: Keratin Research Large Set- Brazilian Keratin Hair Straightening Complex Long-Lasting Treatment with Argan Oil for Smooth, Professional Straightening Results (4 PC XL VALUE) : Beauty & Personal Care

Review: Straight hair for a fraction of the price! - Used this product for years. Don’t pay high price in salon to straighten your hair. I do it myself without help. Simple directions, easy to use. Make sure room is well ventilated though, strong smell during application. My hair is stronger, shinier and so soft. Stays straight for about 6 months! Get the clarifying shampoo too. Use before straightening. Takes all the products you might use out of your hair so you get great results.
Review: Takes some doing but saves me beauoup dollars! Well worth the time and effort. - Oh happy day! Why? Because I'm never paying $200-400 to get my hair done ever ever again. Ever. I don't have any "before" pics, and really if I did, they'd be pointless. My hair's been processed to hell and back for years. I was born with 3a,3b,and 3c-type curls all over my head at once. Soft curls at the front, tighter squiggles in the back, shrubby underneath. It's finely textured but there's a lot of it, giving the illusion that it's thick. I began doing Brazilian Blow Outs five years ago when I moved from the cool northeast to Southern Louisiana - home of the sort of humidity they write books about. New Orleans is a great city, but it's a total hair nightmare nine months of the year. Brazilian blow outs changed my life but they left me chained to a very expensive hair routine. Although an involved, lengthy procedure, the blow outs didn't seem *hard* and I often wondered whether I could do them at home. TURNS OUT I CAN! I was worried about messing it up terribly so I enlisted my husband to help with the back. "Hey honey, can you help me with my hair tomorrow? I'm gonna do the keratin at home." "The what? Well, okay, sure." "We'll need to do it outside." "Whatever." "And we should have a fan." "Mmmmhmmm." "For the burning and the runny eyes." "Sure...wait - what? Burning? What is this stuff?" After calming him down and assuring him it was perfectly safe (the jury is still out on that, though) we set up shop in the yard with a mirror, a fan, a blow dryer, a tail comb, a dye brush, a plastic straightening comb and my trusty Babyliss Nano Titanium 1.75" iron (git you one o'these because they are amazing). The clarifying shampoo might make you nervous because all signs of life and health WILL be sucked out of your hair as if by vacuum. Worry not. This is normal. Application was simple, but I do think he used too much. Aim for saturating each and every hair, but not for making your whole head drippy-wet with the stuff. Apply it in small sections, comb it through with the tail comb, and whatever comes off the comb, wipe it off. No need to completely panic if you over apply: in the end, over-applying only made Day 1 & 2 gummy and strange. Past that it was fine. You're going to want to be in a VERY well ventilated area during the blow dry/flat ironing stage. Even outdoors with a fan it was hard on the eyes and mucus membranes. If you HAVE to do this in an apartment, I suggest doing it in a room other than the bathroom because unless you have an exhaust fan it just might be the last act of your life. Set yourself up someplace where you can open a real window. If you've enlisted the help of a partner, you may have to endure listening to "OHMIGOD WHAT IS THAT SMELL?" and "There is no way that's okay. Please think of your brain cells." and "No, seriously, stop this now or I'm going inside." for however long it takes to dry your hair. The ironing was easy - I used large, wide clips to section parts off, then used the straightening comb to comb through and "hold" sections of the sections (very small sections, mind you; my sections were thin, but wide, because my iron is wide. Make section width based on whatever flatiron you have, but make 'em thin.). At first I thought the comb was unnecessary, but when you're passing a 400F iron over a small section of hair 7-9 times? It's HOT and you do not want to be guiding that hair through the iron with your hand. Buy a spring-loaded straightening comb. Worth the $5. This was stinky, eye-watering business. The fan helped. Ironing the product in was very simple with a mirror. My husband stuck around (ten feet away) but I didn't need help by that point, anyhow. The finished product this first go-round was verrrry disappointing at first. Very gummy, not slick and smooth. Very coated-feeling. I attribute this to over-application. My husband noticed, too. He kept apologizing and said "That is NOT how you look when you come home from that salon.". But after two more days of light ironing before going out - presto: it was perfect. I washed & conditioned it with the stuff that came in the box a week later and it dried super quick and ironed like a breeze. It's got great body, too. I would recommend this product to anyone who has already experienced a professional keratin/Brazilian Blow Out treatment at some point. At least that way you'll know how your hair will behave and you'll have an idea of what to expect. Anyone going into this expecting to have pin-straight hair after washing without having to either blow-dry, flat iron or both should turn right around and buy a traditional straightening product. That's not what this is. You still have to put some work into getting your hair straight, just *a lot* less work than without the treatment at all. This stuff will knock out frizz and leave your hair smooth and silky. It will loosen curls considerably for the first couple of weeks, but as the products wears off, your curls will return. TLDR: Even with our mistake of over-applying I'll still likely get two more applications out of this $79 bottle. Three trips to the salon for the same treatment would cost between $600-800. Absolutely worth a few hours of my time and effort, and worth a little eye-burning. ;)

## Features

- Straighten, smooth, strengthen, and repair damage across all hair types.
- Results last 4-6 months. Save time and wake up with smooth, beautiful hair every day.
- Easy-to-apply instructions. Responsive support available to answer any questions.
- Professional-grade results at home. Effective formula containing a powerful blend of Keratin proteins, Argan oil, and Collagen Amino Acids.
- Includes: straightening cream, clarifying shampoo, moisturizing shampoo, and conditioner.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007KB8ZW2 |
| Best Sellers Rank | #53,866 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #2,183 in Shampoo & Conditioner Sets |
| Brand | KERATIN RESEARCH |
| Brand Name | KERATIN RESEARCH |
| Customer Reviews | 4.2 out of 5 stars 7,245 Reviews |
| Hair Type | All |
| Item Form | Liquid |
| Item Weight | 8 ounces |
| Manufacturer | KERATIN RESEARCH |
| Manufacturer Part Number | 821040000000 |
| Material Features | Natural |
| Model Number | KR3404 |
| Number of Items | 1 |
| Product Benefits | Frizz Control,Hydrating,Intense Conditioning,Moisturizing,Shine,Smoothening,Softening,Split Ends,Straightening,Strengthens Product Benefits Frizz Control,Hydrating,Intense Conditioning,Moisturizing,Shine,Smoothening,Softening,Split Ends,Straightening,Strengthens See more |
| Scent | Floral |
| Scent Name | Floral |
| Set Name | Keratin Research 4-Piece Hair Treatment Set |
| Special Ingredients | Keratin,Coconut-oil,Argan-oil |
| UPC | 821040014105 |
| Unit Count | 40.57 Fluid Ounces |

## Product Details

- **Brand:** KERATIN RESEARCH
- **Hair Type:** All
- **Item Form:** Liquid
- **Item Weight:** 8 ounces

## Images

![Large Set- Brazilian Keratin Hair Straightening Complex Long-Lasting Treatment with Argan Oil for Smooth, Professional Straightening Results (4 PC XL VALUE) - Image 1](https://m.media-amazon.com/images/I/71KZ8JovoRL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Any good brand name of durable flat iron Pls? there are so many out there but don't know how to purchase the right one? any help  or advice Thnx**
A: GHD

**Q: Can the leftover KHT be used for a future treatment?**
A: Yes, you can...mine had enough treatment for 4 different times...you will not regret it... I had many compliments..

**Q: can this be applied on top of other keratin treatments? I last did my daughters hair 4 months ago with Kerasilk keratin treatment.**
A: I'm a not a professional hair dresser by any means. I just like saving money.  I had previously done my hair at a salon and they used a different treatment. I could tell because it smelled different and it was very flaky when they dried it.  I used Complex Brazilian Global and my hair turned out gorgeous.  You just have to make sure you blow dry it VERY straight, like they do in the salon and also seal it with the hair straightener.  Good luck!

**Q: Can I put my hair up within the three days I leave it in?**
A: You shouldn't because it will leave the lines in your hair. Try to keep it as straight as possible I straightened my hair everyday to keep it perfect.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Straight hair for a fraction of the price!
*by M***E on August 21, 2026*

Used this product for years. Don’t pay high price in salon to straighten your hair. I do it myself without help. Simple directions, easy to use. Make sure room is well ventilated though, strong smell during application. My hair is stronger, shinier and so soft. Stays straight for about 6 months! Get the clarifying shampoo too. Use before straightening. Takes all the products you might use out of your hair so you get great results.

### ⭐⭐⭐⭐⭐ Takes some doing but saves me beauoup dollars! Well worth the time and effort.
*by M***S on June 5, 2016*

Oh happy day! Why? Because I'm never paying $200-400 to get my hair done ever ever again. Ever. I don't have any "before" pics, and really if I did, they'd be pointless. My hair's been processed to hell and back for years. I was born with 3a,3b,and 3c-type curls all over my head at once. Soft curls at the front, tighter squiggles in the back, shrubby underneath. It's finely textured but there's a lot of it, giving the illusion that it's thick. I began doing Brazilian Blow Outs five years ago when I moved from the cool northeast to Southern Louisiana - home of the sort of humidity they write books about. New Orleans is a great city, but it's a total hair nightmare nine months of the year. Brazilian blow outs changed my life but they left me chained to a very expensive hair routine. Although an involved, lengthy procedure, the blow outs didn't seem *hard* and I often wondered whether I could do them at home. TURNS OUT I CAN! I was worried about messing it up terribly so I enlisted my husband to help with the back. "Hey honey, can you help me with my hair tomorrow? I'm gonna do the keratin at home." "The what? Well, okay, sure." "We'll need to do it outside." "Whatever." "And we should have a fan." "Mmmmhmmm." "For the burning and the runny eyes." "Sure...wait - what? Burning? What is this stuff?" After calming him down and assuring him it was perfectly safe (the jury is still out on that, though) we set up shop in the yard with a mirror, a fan, a blow dryer, a tail comb, a dye brush, a plastic straightening comb and my trusty Babyliss Nano Titanium 1.75" iron (git you one o'these because they are amazing). The clarifying shampoo might make you nervous because all signs of life and health WILL be sucked out of your hair as if by vacuum. Worry not. This is normal. Application was simple, but I do think he used too much. Aim for saturating each and every hair, but not for making your whole head drippy-wet with the stuff. Apply it in small sections, comb it through with the tail comb, and whatever comes off the comb, wipe it off. No need to completely panic if you over apply: in the end, over-applying only made Day 1 & 2 gummy and strange. Past that it was fine. You're going to want to be in a VERY well ventilated area during the blow dry/flat ironing stage. Even outdoors with a fan it was hard on the eyes and mucus membranes. If you HAVE to do this in an apartment, I suggest doing it in a room other than the bathroom because unless you have an exhaust fan it just might be the last act of your life. Set yourself up someplace where you can open a real window. If you've enlisted the help of a partner, you may have to endure listening to "OHMIGOD WHAT IS THAT SMELL?" and "There is no way that's okay. Please think of your brain cells." and "No, seriously, stop this now or I'm going inside." for however long it takes to dry your hair. The ironing was easy - I used large, wide clips to section parts off, then used the straightening comb to comb through and "hold" sections of the sections (very small sections, mind you; my sections were thin, but wide, because my iron is wide. Make section width based on whatever flatiron you have, but make 'em thin.). At first I thought the comb was unnecessary, but when you're passing a 400F iron over a small section of hair 7-9 times? It's HOT and you do not want to be guiding that hair through the iron with your hand. Buy a spring-loaded straightening comb. Worth the $5. This was stinky, eye-watering business. The fan helped. Ironing the product in was very simple with a mirror. My husband stuck around (ten feet away) but I didn't need help by that point, anyhow. The finished product this first go-round was verrrry disappointing at first. Very gummy, not slick and smooth. Very coated-feeling. I attribute this to over-application. My husband noticed, too. He kept apologizing and said "That is NOT how you look when you come home from that salon.". But after two more days of light ironing before going out - presto: it was perfect. I washed & conditioned it with the stuff that came in the box a week later and it dried super quick and ironed like a breeze. It's got great body, too. I would recommend this product to anyone who has already experienced a professional keratin/Brazilian Blow Out treatment at some point. At least that way you'll know how your hair will behave and you'll have an idea of what to expect. Anyone going into this expecting to have pin-straight hair after washing without having to either blow-dry, flat iron or both should turn right around and buy a traditional straightening product. That's not what this is. You still have to put some work into getting your hair straight, just *a lot* less work than without the treatment at all. This stuff will knock out frizz and leave your hair smooth and silky. It will loosen curls considerably for the first couple of weeks, but as the products wears off, your curls will return. TLDR: Even with our mistake of over-applying I'll still likely get two more applications out of this $79 bottle. Three trips to the salon for the same treatment would cost between $600-800. Absolutely worth a few hours of my time and effort, and worth a little eye-burning. ;)

### ⭐⭐⭐⭐⭐ IT WORKS!
*by G***3 on June 15, 2016*

Background Story: I never write reviews but felt obligated to write one for this product because I was skeptical of trusting the other reviewers (not that there's anything wrong with their posts, I'm just a naturally skeptical person especially when trusting online reviewers). I'm not going to lie, I was very nervous to try this when I first ordered it. I spent endless amount of time looking up reviews outside of Amazon, watching youtube videos and trying to find blogs specifically reviewing Keratin Research. As a child, I had naturally thick curly hair...Shirley Temple type hair. But as I got older, plus years of color treatment and frying with hair iron/blowdryer, my hair became extremely frizzy, puffy and wavy. My hair is deceivingly thick and course. On average, it takes me about an hour to (messy) blow dry plus 35 min to flat iron. I used to get the Keratin treatment done at a salon when I lived in Miami because the stylist only charged $150 for my thick head and was referred to me by a close friend who had done the treatment several times with the same lady and has gorgeous hair. I now live in LA and have been struggling for a year to find a salon that would charge me under $250. The most inexpensive price I heard was treatment starts at $200 and goes up from there pending on length and thickness. My hair is up to my shoulders but extremely thick so I was quoted $275 with a 10% first time discount. I decided after price searching to take a leap of faith and see if I could do it myself. For the record, I HAVE NEVER DONE ANYTHING MYSELF TO MY HAIR. I figured I had done the treatment enough times to know the steps, plus with today's digital age, there's plenty of tutorials online. When I received the package, I freaked myself out and decided not to do it so the bottles hung out under my sink for a month until I worked up the courage to try it. What I used: Keratin Research Clarifying Shampoo Keratin Research Keratin Bottle A fine tooth comb ($2 from target) Hair color mixing bowl and application brush ($5 from Sallys beauty supply) A large ceramic round brush (one i stole from my mom years ago, don't know where she got it) 8 duck teeth hair clips Baby bliss pro blow dryer Conair tourmaline hair iron ($65 from target) Hair straightening hair clamp comb ($6 sallys) Regular wet brush (normal prong brush from CVS, i think brand is revlon?) Face Mask and gloves (my husband works in a hospital so he brought those home for me) Application: I started the process at 7pm with the clarifying shampoo. My hair was pretty dirty so I washed it 3x using the clarifying shampoo to make sure all the oil was out. After the 2nd wash, my hair texture felt tougher then usual which is expected of the clarifying shampoo. It was hard to detangle and brush, just as my experiences in the past with salon treatment. My hair took about 40 minutes to blow dry using WARM setting instead of HOT setting on blow dryer. After, i sectioned my hair into 3 pieces and began (heart racing) applying the treatment. I used the application brush and applied the product about an inch away from scalp and half way down my hair on both sides, then used the fine tooth comb to remove excess. As i got closer to the front of my head, i began to smell the fumes but it was manageable (way better then the salon i used to go to in my opinion). After waiting the 20 minutes, i began to blow dry using WARM heat setting (not HOT setting). This process took me the longest because I have very a lot of hair. I used a combination between the round ceramic brush and regular wet brush because i became impatient. This process took about an hour and 15min, I did it outside on the balcony of my apartment with a fan blowing the fumes away. Once hair was completely dry, I began to iron. I went over each piece around 4-5x. This is where you really feel the fumes, however in my personal opinion the fumes were way worse in the salon. When the ironing was over, my hair was very straight, almost too straight for my personal style but thats what the process entails in order to seal the treatment. I left the treatment in for 3 days and ironed my hair (lightly, like 1x each strand) each of those days. I made sure not to put my hair up and just let it stay flat. Results: This product really does work. Same result as salon for half the price. I only used about a third of the bottle so this should last me another 2 treatments. My hair now dries some what acceptable, blow drying and styling time is cut substaintially (it takes me about 25-30 min to blowdry and iron my entire hair), my hair doesn't frizz in the rain, humidity, or with sweat AND most importantly, my hair did not burn off, fall out, or any other the problems. I am really pleased with this product and glad i decided to trust the other reviewers.

## Frequently Bought Together

- Keratin Research Complex Brazilian Keratin Hair Argan Oil Blowout Treatment Professional Results Straightening and Smoothing Hair Queratina Keratina
- Straightening Easy Comb High Heat resistant for Brazilian Keratin Hair Treatment and Straightening Spring Action for Speedy flat ironing
- Herstyler Hair Straightening Comb - Flat Iron Comb - Hair Straightener Comb With a Firm Grip - Styling Comb for Women (Pink)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-11-06*