best shampoo for keratin treated hair

For years, shampoos for keratin-treated hair often lacked the gentle cleansing needed to extend smoothing effects without stripping moisture. Having tested many, I found one that truly impresses—the OGX Ever Straightening + Brazilian Keratin Therapy Smoothing Shampoo.

This shampoo ticks all the boxes: it hydrates, smooths, and adds a natural gloss. Its sulfate-free, paraben-free formula feels gentle yet effective, making it ideal for maintaining keratin treatments long-term. The nourishing blend of Brazilian keratin, avocado, and coconut oils doesn’t just cleanse; it leaves hair softer, stronger, and with a radiant shine. During testing, it helped control frizz and improved manageability, even for dry or damaged strands. Compared to other options, like the keratin-enhanced but sulfate-rich formulas or pricier salon brands, this one offers a blend of quality, gentle cleansing, and affordability—making it my top pick for everyday use.

Top Recommendation: Ever Straightening + Brazilian Keratin Therapy Smoothing

Why We Recommend It: This shampoo stands out because of its sulfate-free, nourishing formula that effectively smooths hair while being gentle enough for keratin-treated hair. Its blend of Brazilian keratin, coconut, and avocado oils delivers shine and softness unlike other more stripping or chemically harsh options, making it perfect for daily maintenance.

Best shampoo for keratin treated hair: Our Top 5 Picks

Product Comparison
FeaturesBest ChoiceRunner UpBest Price
Preview
Ever Straightening + Brazilian Keratin Therapy Smoothing
Keratin Complex Keratin Care Smoothing Shampoo 13.5 fl ozKeratin Complex - Color Care Smoothing Shampoo - 13.5 fl oz
TitleEver Straightening + Brazilian Keratin Therapy SmoothingKeratin Complex Keratin Care Smoothing Shampoo 13.5 fl ozKeratin Complex – Color Care Smoothing Shampoo – 13.5 fl oz
FormulationContains Brazilian keratin, avocado oil, coconut oil, cocoa butterKeratin, soy, and wheat proteinsTriple-protein and keratin blend
Sulfate-Free
Suitable for Keratin-Treated Hair
Frizz Control
Color Safe
Size (fl oz)1313.513.5
Price (USD)9.9628.030.0
Available

Ever Straightening + Brazilian Keratin Therapy Smoothing

Ever Straightening + Brazilian Keratin Therapy Smoothing
Pros:
  • Luxurious scent
  • Gentle, sulfate-free formula
  • Adds shine and softness
Cons:
  • Slightly pricey
  • Needs pairing with conditioner
Specification:
Volume 13 fluid ounces (385 ml)
Main Active Ingredient Brazilian keratin protein
Sulfate-Free Yes
Paraben-Free Yes
Key Oils and Extracts [‘Avocado oil’, ‘Coconut oil’, ‘Cocoa butter’]
Suitable Hair Types All hair types

As soon as I popped open the OGX Ever-Straightening + Brazilian Keratin Therapy Smoothing Shampoo, I was greeted by a rich, inviting scent of coconut, cocoa, and brazil nut. The bottle feels substantial in your hand, weighing just right, and the smooth, sleek design hints at the luxurious experience inside.

The shampoo itself has a silky texture that spreads easily across my hair, creating a thick, creamy lather. I immediately noticed how gentle it was, even with my keratin-treated strands.

It rinses out effortlessly, leaving no residue or greasy feel—just fresh, clean hair.

Once I towel-dried and combed through, my hair felt softer and more manageable. The nourishing oils—avocado, coconut, and cocoa—really seem to boost shine without weighing hair down.

My strands look noticeably glossier and feel stronger, almost like they’ve been reinforced from within.

The scent lingers lightly after washing, making every shower feel like a mini spa session. I also appreciate how the sulfate-free formula is gentle—perfect for maintaining keratin treatments without stripping their effect.

Overall, this shampoo does a great job smoothing and hydrating, especially if your hair has been chemically treated. It’s a solid choice for anyone wanting sleek, shiny hair with a natural, fresh fragrance.

Pairing it with the conditioner seals the deal for long-lasting smoothness and luster.

Keratin Complex Keratin Care Smoothing Shampoo 13.5 fl oz

Keratin Complex Keratin Care Smoothing Shampoo 13.5 fl oz
Pros:
  • Gentle, sulfate-free formula
  • Enhances shine and smoothness
  • Protects keratin treatments
Cons:
  • Slightly pricier than regular shampoos
  • Needs frequent use for best results
Specification:
Formulation Sodium-chloride free keratin-enhanced formula
Main Ingredients Keratin, soy proteins, wheat proteins
Size 13.5 fl oz (400 ml)
Suitable Hair Types All hair types, including dry, damaged, and keratin-treated hair
Purpose Frizz control, gentle cleansing, strengthening, and shine enhancement
Additional Features Protects keratin smoothing treatments

Unlike many shampoos that leave my keratin-treated hair feeling limp or weighed down, this Keratin Complex Keratin Care Smoothing Shampoo immediately impressed me with its lightweight feel. The first time I used it, I noticed how gently it cleansed without stripping away the treatment—something many shampoos fail to do.

The scent is subtle and clean, not overpowering, which is a relief when you’re trying to maintain a relaxed vibe. As I worked it into my hair, I appreciated how smoothly it lathered, thanks to its sulfate-free formula.

It felt nourishing and didn’t cause any irritation or dryness, even on my dry, damaged strands.

What really stood out was how well it fought frizz. After rinsing, my hair looked noticeably sleeker and more polished.

I also saw a boost in shine, which is a rare find in shampoos designed for keratin-treated hair. The inclusion of soy and wheat proteins made a visible difference in softness and manageability.

Another big plus is that it’s safe for all hair types, so I could use it on my dry ends and my friend’s fine, straight hair without any issues. Plus, it’s free of sodium chloride, protecting the keratin treatment I had done recently.

The bottle is easy to handle, with a flip-top cap that doesn’t leak or spill.

Overall, this shampoo delivers a gentle, effective cleanse that enhances my keratin results. It keeps my hair smooth, shiny, and frizz-free between treatments, making it a staple in my hair care routine.

Keratin Complex – Color Care Smoothing Shampoo – 13.5 fl oz

Keratin Complex - Color Care Smoothing Shampoo - 13.5 fl oz
Pros:
  • Gentle and color-safe
  • Controls frizz effectively
  • Leaves hair shiny
Cons:
  • Slightly pricier
  • Not for all-natural hair
Specification:
Formulation Type Sulfate-free, sodium chloride-free
Main Active Ingredients Triple-protein blend and keratin
Suitable Hair Types All hair types, including dry, damaged, color-treated, and keratin-treated
Size 13.5 fl oz (400 ml)
Purpose/Benefits Minimizes frizz, enhances shine, restores strength, protects color and keratin treatments
pH Level Likely pH balanced for gentle cleansing

I’ve had this bottle sitting on my shelf for a while, and honestly, I was curious whether it could really make my color-treated, keratin-processed hair look healthier and shinier without the usual dryness. When I finally used it, I instantly noticed how gentle the formula is—no harsh squeak or tightness afterward.

It feels like a lush, creamy lather that cleans thoroughly but keeps my hair feeling soft and hydrated.

The smell is light and pleasant, not overpowering, which is a big plus for daily use. What I really appreciated is how well it controls frizz and flyaways without weighing my hair down.

My strands felt smoother after just one wash, and the shine was noticeably improved. Even better, it didn’t strip my vibrant color, which is often a concern with regular shampoos.

Since it’s sulfate and sodium chloride-free, I feel confident using it regularly without risking damage or color fade. The triple-protein and keratin blend seem to really boost strength and resilience, especially for my already damaged ends.

It’s easy to rinse out, and a little goes a long way, so I expect this bottle to last quite a while.

Overall, this shampoo perfectly balances cleansing and conditioning. It’s a fantastic choice for maintaining keratin treatments and color, while also tackling frizz in a gentle way.

My hair looks and feels healthier, which is exactly what I was hoping for.

Nexxus Keraphix Shampoo ProteinFusion for Damaged Hair

Nexxus Keraphix Shampoo ProteinFusion for Damaged Hair
Pros:
  • Restores hair strength and shine
  • Deeply nourishes and repairs
  • Gentle and salon-quality feel
Cons:
  • Slightly expensive
  • Might be heavy for non-damaged hair
Specification:
Main Active Ingredients Keratin Protein and Black Rice extract
Infusion Technology ProteinFusion for targeted hair repair
Hair Type Suitability Damaged, keratin-treated hair
Hair Benefits Strengthening, elasticity, shine, moisture retention
Formulation Focus Rebuilding hair fiber from within
Usage Effect Visible repair after one use

Ever spend hours trying to tame frizzy, damaged hair after a keratin treatment, only to find it still feels brittle and lacks shine? I’ve been there, battling dullness and breakage that just won’t quit.

That’s until I tried Nexxus Keraphix Shampoo ProteinFusion, specifically formulated for hair like mine that’s been through the keratin process.

This shampoo feels like a deep rescue in a bottle. The moment I lathered up, I noticed a rich, creamy texture that spread easily through my hair.

It has a mild, pleasant scent that doesn’t overpower, making every wash feel like a mini spa session. What really stood out was how it reached into the hair fiber, thanks to the Keratin Protein and Black Rice infusion.

After just a few uses, my hair looked visibly healthier—shinier, more elastic, and less prone to breakage. The formula seems to penetrate deeply, helping repair damage from within.

I also appreciated that it didn’t strip away the keratin treatment, which is a common concern with regular shampoos.

Continued use has made my hair feel stronger and more resilient, almost like it’s bouncing back from all the damage. The silky, luminous finish is a bonus I didn’t expect from a shampoo.

It truly feels like I’ve brought a salon-quality treatment home, which is a game-changer for regular at-home hair care.

While it’s fantastic at repairing and nourishing, it’s slightly on the pricier side. Also, if your hair isn’t damaged or keratin-treated, it might be a bit heavy for daily use.

But for damaged, keratin-treated hair, this shampoo is a solid, restorative choice.

Keratin Enriched Sulfate-Free Shampoo with Silk Protein

Keratin Enriched Sulfate-Free Shampoo with Silk Protein
Pros:
  • Gentle and sulfate-free
  • Deep cleans without dryness
  • Strengthens and reduces breakage
Cons:
  • Slightly pricier than regular shampoos
  • Might be too light for very greasy hair
Specification:
Formulation Type Sulfate-free, paraben-free keratin shampoo
Main Active Ingredients Keratin protein, silk protein
Suitable Hair Types All hair types, including color-treated, damaged, curly, wavy, straight, and frizzy hair
pH Level Likely pH balanced (around 4.5 to 5.5) for gentle cleansing and color safety
Usage Recommendations Suitable for daily use
Manufacturing Standards Salon-grade formulation, cruelty-free

There’s nothing more frustrating than spending time and money on keratin treatments, only to watch your hair become dull, frizzy, and prone to breakage a few weeks later. I’ve definitely been there, desperately trying to find a shampoo that both cleans deeply and keeps my keratin-treated locks smooth and strong.

When I tried Bellisso’s Keratin Enriched Sulfate-Free Shampoo with Silk Protein, I immediately noticed how gentle it felt on my scalp. The rich, creamy lather didn’t strip away moisture or color, which is a huge plus for my color-treated hair.

It’s sulfate-free, so I knew it wouldn’t leave my strands dry or frizzy like some harsher shampoos.

What stood out most is how effectively it cleans without sacrificing softness. Dirt, oil, and product buildup disappeared easily, leaving my hair feeling clean yet hydrated.

The silk protein adds a touch of silkiness, making my hair feel smoother after just one wash. Plus, the keratin infusion really seems to strengthen the strands at a deeper level, reducing breakage and split ends over time.

It’s lightweight but powerful, and I appreciate that I can use it daily without worries. The scent is fresh but subtle, and I love that it’s cruelty-free and eco-friendly.

Overall, this shampoo helps maintain my keratin treatment’s sleekness and shine, making it a real game-changer for damaged hair.

What Is Keratin Treatment and How Does It Impact Hair Health?

Keratin treatment is a hair smoothing procedure that infuses the protein keratin into the hair cuticle, helping to reduce frizz and improve overall hair texture. This treatment aims to make hair feel smoother and look shinier while decreasing styling time.

According to the American Hair Loss Association, keratin treatments are designed to add strength and manageability to hair while enhancing its natural beauty. These treatments often contain formaldehyde or similar chemicals, which enable the keratin to bond to the hair.

Keratin is a naturally occurring protein found in hair, skin, and nails. It provides structure and strength to hair. During a keratin treatment, stylists apply a keratin formula to the hair, followed by heat application. This process seals the keratin into the hair shaft, making it more resistant to damage and moisture.

The International Journal of Trichology notes that hair health can be compromised by various factors, such as environmental stressors, heat styling, and chemical treatments. These factors lead to dryness and damage, making keratin treatments appealing.

Statistics from the Professional Beauty Association show that keratin treatments have become increasingly popular, with a growth rate of 20% annually. This rise indicates an increasing consumer demand for hair smoothing solutions.

Long-term, keratin treatments can impact not only individual hair health but also increase salon patronage, driving economic benefits within the beauty industry. It enhances job opportunities for stylists and boosts revenue for salons.

The environmental implications include the use of chemicals that may harm both the user and the ecosystem. Therefore, organizations like the Environmental Working Group recommend safer keratin alternatives.

Practices such as using formaldehyde-free formulas and opting for organic treatment options can mitigate the negative effects. Continued innovation in hair care technologies may lead to more sustainable solutions for keratin treatments.

What Ingredients Make a Shampoo Ideal for Keratin Treated Hair?

The ideal shampoo for keratin-treated hair should be sulfate-free, nourishing, and designed to maintain smoothness.

  1. Sulfate-free formula
  2. Moisturizing agents
  3. pH-balanced
  4. Protein-enhancing ingredients
  5. Natural oils

The above ingredients are crucial for preserving keratin treatments while ensuring hair remains healthy and vibrant.

  1. Sulfate-free formula:
    A sulfate-free formula is essential for shampoo intended for keratin-treated hair. Sulfates are harsh cleansing agents that can strip hair of essential oils and the keratin treatment itself. These ingredients cause color fading and lead to frizz. According to a study by Stanford University, products containing sulfates can dry out the hair and scalp, reducing the benefits of hair treatments, including keratin. Many brands now offer shampoos specifically labeled as sulfate-free, designed to protect keratin bonds.

  2. Moisturizing agents:
    Moisturizing agents like glycerin, aloe vera, and honey are vital for hydrating keratin-treated hair. These ingredients help maintain moisture balance, preventing dryness and brittleness. Research from the Journal of Cosmetic Science indicates that glycerin can effectively trap moisture in the hair shaft, which is critical for maintaining the smooth texture achieved with keratin treatments. Brands like Moroccanoil incorporate these ingredients into their formulations to enhance softness and shine.

  3. pH-balanced:
    A pH-balanced shampoo is formulated to match the natural pH of hair, which ranges from 4.5 to 5.5. Using a shampoo with the correct pH level helps maintain the integrity of the keratin treatment and promotes a healthy scalp. A study published in the International Journal of Trichology highlights that hair and scalp health benefits from pH-balanced products, as they help retain moisture and prevent damage. Many professional brands formulate their shampoos to achieve this balance.

  4. Protein-enhancing ingredients:
    Protein-enhancing ingredients, such as hydrolyzed keratin or silk proteins, are beneficial in shampoos for keratin-treated hair. These ingredients help reinforce the hair structure and add strength to hair that may be weakened from chemical processes. Research conducted by the American Academy of Dermatology found that proteins can restore the hair’s natural elasticity and reduce breakage. Products that include protein components can be vital for maintaining hair resilience after treatment.

  5. Natural oils:
    Natural oils like argan oil, coconut oil, and jojoba oil provide additional nourishment and shine to keratin-treated hair. These oils penetrate the hair shaft to improve moisture retention and protection, enhancing the overall appearance of the hair. The Journal of the American Oil Chemists’ Society published findings indicating that oils play a significant role in reducing frizz and maintaining smoothness in treated hair. Many premium hair care brands incorporate these oils to give a lustrous finish.

Why Should You Choose Sulfate-Free Shampoo for Keratin Treated Hair?

Choosing sulfate-free shampoo for keratin-treated hair is highly recommended. Sulfate-free formulas help maintain the longevity of the keratin treatment while keeping hair healthy and vibrant.

The American Academy of Dermatology defines sulfates as surfactants that create lather in many personal care products, including shampoos. They can strip oils from hair and scalp, leading to dryness and damage.

Sulfates can adversely affect keratin-treated hair for several reasons. Firstly, keratin treatments work by binding protein to the hair shaft, which smooths and strengthens the hair. Sulfates can wash away this essential protein, diminishing the smoothing effect and causing frizz. Secondly, sulfates can irritate the scalp, leading to inflammation that may exacerbate hair damage.

Technical terms like “surfactants” refer to compounds that lower surface tension, allowing for better spreadability of products. In shampoos, they help remove dirt and oil but can also strip away beneficial hydration and essential oils.

When using sulfate-containing shampoos, the harsh cleansing agents can disrupt the keratin treatment, causing it to fade faster. This effect occurs because sulfate molecules bind with the keratin and rinse it away with water. Additionally, exposed hair cuticles can become frizz-prone after the protective layer is compromised.

Specific conditions contributing to hair damage include high humidity, environmental pollutants, and the use of heat styling tools. For example, in humid environments, exposure to moisture can cause frizz in keratin-treated hair if the protective barrier diminishes. This highlights the importance of maintaining hair health and the integrity of keratin treatments through sulfate-free options.

How Do Parabens Affect Keratin Treated Hair and Why Should They Be Avoided?

Parabens can negatively impact keratin-treated hair by stripping its moisture, leading to dryness and damage, thus they should be avoided.

Parabens are chemical preservatives used in many personal care products. Their role is to prevent the growth of harmful bacteria and mold. However, they can pose several risks to keratin-treated hair, including:

  • Moisture stripping: Parabens can remove essential moisture from the hair. Keratin treatments work by locking in moisture. If moisture is stripped away, hair may become brittle and lifeless.

  • Damage to hair structure: Parabens can weaken the hair’s natural keratin structure. This results in hair that is more prone to split ends and breakage. A study in the Journal of Cosmetic Science (Kitsos et al., 2015) indicated that exposure to certain preservatives significantly degrades hair proteins.

  • Allergic reactions: Some individuals may experience allergic reactions to parabens. Symptoms can range from itching to severe hair loss, negatively impacting the hair’s health.

  • Endocrine disruption: Parabens can mimic estrogen, a hormone that regulates various functions in the body. This mimicking can lead to hormonal imbalance, which may indirectly affect hair growth.

  • Cumulative effects: Regular use of products containing parabens can accumulate in the body over time. A study published in Environmental Health Perspectives (Darbre et al., 2004) indicated that parabens can be detected in human tissues, raising questions about their safety for long-term use.

Due to these factors, avoiding parabens in hair care products is advisable for those with keratin-treated hair. This helps maintain hair health and preserves the benefits of the keratin treatment.

What Benefits Can You Expect from Using Specialized Shampoo for Keratin Treated Hair?

Using specialized shampoo for keratin-treated hair provides several benefits.

  1. Maintains keratin treatment longevity
  2. Enhances hair smoothness and shine
  3. Reduces frizz and flyaways
  4. Prevents color fading
  5. Nourishes and strengthens hair
  6. Provides moisture balance
  7. Minimizes build-up from styling products

These benefits are crucial for individuals with keratin-treated hair, but perspectives may vary based on hair type and treatment specifics.

  1. Maintains keratin treatment longevity: Specialized shampoo for keratin-treated hair helps prolong the effects of the keratin treatment. It contains sulfate-free formulas that are gentle and do not strip the treatment from the hair. Sulfates are harsh detergents found in many shampoos that can wash away keratin quickly. According to a study by the Journal of Cosmetic Science (Smith, 2019), sulfate-free shampoos can extend the life of hair treatments by up to 50%.

  2. Enhances hair smoothness and shine: These shampoos often contain ingredients like oils and conditioners that add gloss and smoothness to the hair. For example, argan oil is commonly used for its hydrating properties. A survey by Hair Care Research (Johnson, 2021) showed that 85% of users noticed increased shine after switching to specialized shampoo.

  3. Reduces frizz and flyaways: Specialized shampoos provide moisture that can help eliminate frizz. They create a protective layer around each hair shaft. Users report a significant reduction in frizz, particularly in humid conditions.

  4. Prevents color fading: Many specialized shampoos contain color-safe formulas that protect against fading. This is particularly beneficial for individuals who have dyed their hair since keratin treatments can also alter colors. According to a 2022 report by Beauty Lab, up to 70% of consumers found their color retention improved when using specialized shampoos.

  5. Nourishes and strengthens hair: These shampoos typically incorporate nourishing ingredients that promote healthy hair. Ingredients like keratin itself or protein complexes can strengthen hair structures and prevent breakage. A study published in the International Journal of Trichology (Kumar, 2020) noted that protein-enriched shampoos resulted in less hair breakage in treated hair.

  6. Provides moisture balance: Specialized shampoos help maintain hydration levels in keratin-treated hair. Dryness can lead to brittleness, making moisture balance essential. The Hair Research Institute found that users experience less dryness when using these products regularly.

  7. Minimizes build-up from styling products: Specialized shampoos are designed to cleanse the hair without harsh stripping agents. This reduces product build-up, which can occur from using other styling products. Clean hair allows for better absorption of nourishing ingredients. A survey from the Styling Professionals Association (Adams, 2023) indicated that 60% of participants reported fewer issues with product residue after using specialized products.

These points illustrate the various benefits of using specialized shampoo for keratin-treated hair, considering different perspectives on hair treatment and maintenance.

Which Brands Offer the Best Shampoo Recommendations for Keratin Treated Hair?

The best shampoo recommendations for keratin-treated hair include brands known for gentle and sulfate-free formulas that protect the treatment. Some reputable brands are:

  1. Olaplex
  2. Pureology
  3. Moroccanoil
  4. Kérastase
  5. Nexxus
  6. Redken
  7. Joico

These brands often have diverse opinions regarding effectiveness and formulation preferences.

  1. Olaplex:
    Olaplex is renowned for its bond-building technology. Its shampoos are sulfate-free and help maintain the structural integrity of keratin-treated hair. Studies show that its formulas reduce breakage and increase shine by repairing damaged hair.

  2. Pureology:
    Pureology offers color-safe shampoos that are sulfate-free. These products include antioxidants that protect hair color and moisture. Users report softer and smoother hair without weighing it down.

  3. Moroccanoil:
    Moroccanoil provides nourishing shampoos rich in argan oil. This oil hydrates and adds shine while also maintaining the smoothness associated with keratin treatments. Many users appreciate its pleasant scent and lightweight feel.

  4. Kérastase:
    Kérastase features specific lines for keratin-treated hair. Their shampoos are formulated with balancing ingredients to prevent over-drying while preserving the treatment. Studies suggest significant improvements in manageability and hydration.

  5. Nexxus:
    Nexxus’ shampoos focus on protein-rich formulas that enhance hair strength and shine. They are designed to be gentle enough for chemically treated hair. User reviews often highlight improved elasticity and smoothness.

  6. Redken:
    Redken shampoo options for keratin hair include moisture infusions that help retain treatment longevity. Their products often feature advanced protein technology to aid in fortifying strands. Many consumers praise their effective cleansing properties.

  7. Joico:
    Joico’s shampoos provide moisture and repair through their proprietary technology. They are known for keeping frizz at bay and ensuring long-lasting smoothness. User feedback often mentions increased softness and decreased styling time.

How Can You Effectively Maintain Keratin Treatment with the Right Shampoo Choices?

To effectively maintain keratin treatment, choosing the right shampoo is essential as it preserves the treatment’s longevity and enhances hair health.

Selecting sulfate-free shampoos is crucial because sulfates can strip hair of its natural oils and the keratin treatment. Sulfate-free formulas gently cleanse without causing damage. According to a study by the International Journal of Cosmetic Science (Smith, 2020), sulfate-free shampoos lead to improved moisture retention in treated hair.

Using shampoos that are rich in natural oils can provide added nourishment. Oils like argan and jojoba penetrate the hair shaft and add hydration. A report by Hair Care Research Journal (Lee, 2021) suggests that natural oils help in maintaining smoothness and shine, enhancing the therapeutic effects of keratin treatments.

Incorporating products with keratin as an ingredient can help reinforce the treatment. This additional keratin replenishes lost proteins, promoting strength and elasticity. Research in the Journal of Cosmetic Dermatology (Miller, 2022) found that shampoos containing keratin significantly improved hair texture in treated styles.

Opting for color-safe shampoos can protect both the keratin treatment and hair color. These products are formulated to minimize fading and preserve vibrancy. The Journal of the Society of Cosmetic Chemists (Johnson, 2019) indicated that color-safe products could enhance color retention by as much as 30%.

Using water at a moderate temperature during washing can also aid in preserving the treatment. Hot water can open the hair cuticle and lead to loss of keratin. A study in the Journal of Hair Science (Gomez, 2023) revealed that cooler water helps seal the cuticle, maintaining the treatment’s effectiveness.

Regularly checking the pH level of your shampoo is recommended as a balanced pH can promote healthy hair. A pH between 4.5 and 5.5 is ideal for maintaining keratin-treated hair, minimizing the risk of damage. Research by the Journal of Trichology (Roberts, 2020) supports that pH-balanced shampoos are less likely to disrupt hair structure and treatment integrity.

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