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Home » Hair Products

Can You Get a Keratin Treatment on Bleached Hair?

Kenneth ByrdBy Kenneth ByrdMBA · 15+ years in hair care · Co-founder of Curl CentricUpdated Sep 14, 20269 min read · Reviewed by Kira Byrd

Evidence-basedPublishing since 2008May contain affiliate links
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Bleaching has a profound effect on your hair, often leaving it in a compromised state. If you've done any research on hair bleaching in the past, you may already know that bleach can strip keratin from the hair.

So, logically you'd think that a keratin treatment can bring your hair back to life. But is that really the case?

There are varying viewpoints on this topic, and we'll explore each of them to help you decide whether you should try a keratin treatment on bleached hair.

Table of Contents

  • 1. Can You Get a Keratin Treatment on Bleached Hair?
  • 2. Key Takeaways
  • 3. What Is a Keratin Treatment for Hair?
  • 4. Brazilian Blowout or at-home Keratin Treatment?
  • 5. Qualities of a Good Keratin Treatment
  • 6. Good Keratin Treatments for Bleached Hair
  • 7. Frequently Asked Questions

Can You Get a Keratin Treatment on Bleached Hair?

You can get a keratin treatment on bleached hair. However, when you combine a keratin treatment with bleached hair, there could be negative consequences, especially if you choose the wrong keratin treatment.

If you decide to go and get a Brazilian Blowout after bleaching your hair, you will likely come out with less hair and more split ends. If you opt for an at-home keratin treatment, the results could go either way, and that depends on which keratin treatment you purchase.

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Key Takeaways

  • Keratin Treatment Options: Two types are Brazilian Blowout and at-home treatments. Brazilian Blowouts use high heat and strong chemicals, potentially damaging bleached hair. At-home treatments offer more control but vary in effectiveness and ingredients.
  • Concerns with Bleached Hair: Bleached hair is more vulnerable to damage. Keratin treatments can help but may lead to hair loss or breakage if not chosen carefully, particularly after bleaching.
  • Choosing the Right Treatment: Use keratin treatments that don't require high heat or contain harsh chemicals like formaldehyde. Look for products rich in moisturizers and protein fillers to balance keratin and moisture in your hair.
  • Best Practices for Damaged Hair: Avoid Brazilian keratin treatments for hair damaged by bleach due to their intense heat and chemical requirements. Prefer gentle, moisturizing keratin masks or protein treatments that are formaldehyde-free.
  • Recommended Products: Products like the K18 Leave-In Molecular Repair Hair Mask and Olaplex Number 6 Bond Smoother are good options. They help repair the hair's cuticle without needing high heat, making them suitable for bleached or frizzy hair.

What Is a Keratin Treatment for Hair?

The term "keratin treatment" can be used to refer to two different hair treatments. The first is a Brazilian Blowout, which you would get at your local salon. The other is a product or system that you'd use at home to strengthen, repair, straighten, or smooth your hair. We will take a deeper look into both of these in the below sections: 

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Brazilian Blowout

A Brazilian blowout is a keratin-based treatment that gives you shinier, silkier, straighter hair. Many who get a Brazilian Blowout are surprised by the results that they achieve in one session.

Even the curliest hair can be transformed into sleek, straight tresses following this hair treatment. The main issue with it is that it often requires you to use questionable ingredients (formaldehyde, parabens, etc.), and more often than not, your hair will have to be straightened or blow-dried at obscenely high temperatures.

Note: Hairstyles that require the use of heated styling tools often lead to damaged hair. Heat damaged hair isn't repairable since the high temperatures can permanently change your hair's structure.

Once your hair structure changes, your thick, bouncy curls won't return. Like styles that use traditional flat ironing techniques with high temperatures, heat damage is a common result of Brazilian Blowouts. 

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At-Home Keratin Hair Treatments

With an at-home keratin treatment, you don't have to worry about someone else putting excessive heat or questionable products on your hair. However, you will have to do it yourself.

At-home keratin treatments are not all that they're cracked up to be. Often, the formula includes formaldehyde (just like with the Brazilian Blowout), which is a known carcinogen.

Yet, it's important to know that not all at-home keratin treatments are made with the worst ingredients in the world. However, most of them require heat activation, which is not the best thing for anyone's hair.

Home keratin treatments don't last nearly as long as in-salon treatments. So, if you usually get professional keratin treatments, you will likely notice a difference in your hair when using an at-home treatment. 

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Brazilian Blowout or at-home Keratin Treatment?

You may already have an idea of what keratin treatment we'd recommend, but we'd like to be clear. We recommend that you avoid a Brazilian Blowout like the plague if you are experiencing damage or breakage after a round or more of hair bleaching.

That's because dousing your hair in chemicals and heat will do it no good, particularly if it's already damaged. On the other hand, if you decide to go for a topical keratin treatment, you've got to be very selective.

Qualities of a Good Keratin Treatment

No keratin treatment is perfect, but if you think that what your hair needs is more keratin, you have some options that won't leave you with a hair setback. But you have to make sure that your keratin treatment has the following qualities: 

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No Heat Application Requirement

After getting your hair bleached, heat is the last thing that your hair needs. Unfortunately, lots of keratin treatments require you to use heat. For the best results, you should opt for a keratin treatment that doesn't require you to flat iron or heat style your hair. 

No Formaldehyde

Formaldehyde is one of those ingredients that you want to stay far away from. Keratin treatments are known for releasing formaldehyde when you apply heat to your hair immediately after using the treatment. There are a few problems with formaldehyde that we'd like to dive into here.

According to the Environmental Protection Agency, formaldehyde has been shown to cause cancer in a study involving rats. Also, in a study involving human participants who work with formaldehyde regularly, a link was found between cancer and formaldehyde.

So, formaldehyde is not an ingredient that you want in any of your hair products. In the short term, formaldehyde can cause nausea, breathing difficulties, coughing, and irritation to the skin and eyes. 

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Therefore, you want to ensure that your keratin treatment has no traces of formaldehyde or its derivatives. Formaldehyde may be called methanal, formalin, formic aldehyde, methyl aldehyde, methylene oxide, or methylene glycol.

If you see any of these ingredients on the product label, we advise you put the product back on the shelf. A good keratin treatment will not have formaldehyde or any of its derivatives in the formula.

Moisturizers

Bleached hair needs proteins, but it also needs moisture to thrive. That's why you need a keratin treatment that also has moisturizers in the form of oils, emollients, creams, and more. An unbalanced keratin treatment with too much keratin can have a negative effect on your hair, creating stiffness and breakage. 

Good Keratin Treatments for Bleached Hair

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Now that you know what to look for in a keratin treatment, we'd like to share with you a few great keratin treatments for bleached hair.

K18 Leave-In Molecular Repair Hair Mask

This keratin treatment is unlike many. It has conditioners and proteins that help to restore your hair to its former glory. It's a leave-in treatment "conditioner" that takes just 4 minutes to work.

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K18 Leave-In Molecular Repair Hair Mask, 4-Minute Speed Treatment


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To use it, apply it to clean towel-dried hair and do not rinse it out. The keratin in the product helps to rebuild broken keratin bonds in the hair shaft.

It can be used if your hair is damaged from excessive heat styling, bleaching, or coloring your hair. And, of course, it's formaldehyde-free. No heat is required.

Olaplex Number 6 Bond Smoother

Olaplex is a well-known keratin treatment that has gained viral status for its reparative power. Like other keratin treatments, this treatment repairs the keratin bonds in your hair, revealing smoother, healthier strands in just a short time.

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Olaplex No. 6 Bond Smoother


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The product is free of formaldehyde, sulfates, parabens, phosphates, and many other ingredients you don't want in your hair.

All you need to do is apply it to your hair from mid-lengths to ends and style your hair as desired. There's no heat required for this keratin treatment, and it's safe for all hair types.

Infusium Leave-in Treatment

This treatment by Infusium is a protein-based leave-in treatment that leaves your hair smoother, more moisturized, and more manageable.

Infusium Moisturize & Replenish Leave-In-Treatment Spray, 13 OuncePin
Infusium Moisturize & Replenish Leave-In-Treatment Spray, 13 Ounce
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Not only does it have protein to rebuild your hair shaft, but it also has avocado oil and olive oil (among other ingredients) to keep your hair moisturized. To use the treatment, spray it onto your wet or dry hair and then style it as usual. 

Frequently Asked Questions

Welcome to our FAQ section, where we address common questions about keratin treatments on bleached hair. Find concise, easy-to-understand answers that help you make informed decisions for your hair care.

Is It Better to Bleach Hair Before or After Keratin Treatment?

It is generally better to bleach hair before a keratin treatment. The bleaching process can strip the hair's natural keratin and amino acids, leaving it vulnerable. A keratin treatment post-bleaching helps replenish lost keratin, smoothing the hair cuticle and enhancing hair health. However, it's crucial to allow some time between bleaching and the keratin treatment to minimize hair damage.

Are Keratin Treatments Good for Blonde Hair?

Keratin treatments can benefit blonde hair, especially if it's frizzy or damaged. These treatments help smooth the hair cuticle and replenish keratin proteins, resulting in smoother, healthier-looking blonde hair. However, extra care should be taken to choose formulations that are safe for color-treated hair to avoid altering the blonde hair color.

Does Keratin Treatment Strip Color?

Quality keratin treatments should not strip color from dyed hair. They are designed to smooth the hair's cuticle and replenish natural keratin, enhancing the overall appearance and health of colored hair. However, selecting a treatment suitable for color-treated hair is essential to prevent any adverse effects on hair color.

How Soon After Coloring Hair Can I Get a Keratin Treatment?

It's generally recommended to wait at least two weeks after coloring hair before getting a keratin treatment. This waiting period allows the hair color to be set properly, reducing the risk of color fading or chemical damage from the keratin treatment.

How Long After Bleaching Can You Do a Keratin Treatment?

It's advisable to wait at least two weeks after bleaching before undergoing a keratin treatment. This gap helps reduce the risk of further damage to the hair strands and partially allows the hair to recover from the bleaching process.

Can I Do a Keratin Treatment on Bleached Hair?

Yes, you can do a keratin treatment on bleached hair. It can be beneficial as it helps restore natural keratin lost during the bleaching process, leading to smoother and healthier hair. However, it's crucial to choose a gentle treatment designed for bleached or chemically treated hair to avoid additional damage.

Can I Use Keratin Shampoo on Bleached Hair?

Using keratin shampoo on bleached hair is generally safe and can be beneficial. These shampoos can help replenish keratin proteins lost during the bleaching process, aiding in hair cuticle repair and maintaining the health of bleached hair. However, it's important to use shampoos specifically formulated to be gentle on color-treated or bleached hair.

Related Articles

  • Are Dominican Hair Salons Good for Black Hair?
  • What Is the Best Keratin Treatment for African American Hair?
  • How to Bleach Black Hair Without Damage
  • When Can I Wash My Hair After a Brazilian Blowout?

Final Thoughts

Keratin can be beneficial to the hair when delivered in a gentle manner - without heat or damaging ingredients. We encourage you to give one of the keratin treatments above a try, as they are much safer than many of the ones you'll find in the salon or elsewhere.

We hope that this article has answered all of your questions and wish you the best as you take measures to rejuvenate your bleached hair.

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Kenneth Byrd

About the author

Kenneth Byrd

Co-founder and Managing Partner

Publishing on textured hair since 2008MBA, University of Alabama at BirminghamExecutive education, WhartonTop 40 Under 40, Birmingham Business Journal

Kenneth does the research behind the guides here: reading the studies and checking whether a claim holds up before it gets published, under our editorial guidelines. Outside Curl Centric he leads an operations organization of more than 1,000 people, and he serves on the board of Oasis Counseling for Women and Children. Curl Centric's hair typing system is the first listed reference in a peer-reviewed paper in the International Journal of Women's Dermatology, and it is cited by Wikipedia.

More about KennethAbout Curl Centric

Kira Byrd

Hey, I’m Kira

Curl Centric is run by me and my husband Kenneth. We’ve been publishing evidence-based hair care since 2008 to help you care for your curls with confidence.

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