Kerastase Resistance Extentioniste Scalp & Hair Serum 1.7 Fl Oz

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86%
86%
Effectiveness for Hair Growth
91%
Scalp Comfort and Soothing
88%
Non-Greasy Formula
84%
Absorption and Finish
82%
Long-Term Results
90%
Ease of Use (Applicator and Application)
80%
Scent and Fragrance
85%
Ingredient Quality (Ceramides and Creatine R)
87%
Packaging and Dispensing
83%
Hydration for Dry Scalps
92%
Value for Money
89%
Overall Satisfaction
More

Overview

The Kerastase Resistance Extentioniste Scalp & Hair Serum 1.7 Fl Oz is a leave-in treatment designed to nourish and protect the scalp, fostering optimal conditions for healthier hair growth. This serum is part of the renowned Kerastase Resistance Extentioniste line, which is specifically formulated to promote hair length and strength. The product comes in a convenient 1.7 Fl Oz bottle and is suitable for daily use across all hair types, offering a lightweight, non-greasy solution for anyone seeking to enhance scalp health and hair vitality.

Key Ingredients & Benefits

The key ingredients in this scalp serum include ceramides, which help repair and strengthen hair fibers, improving elasticity and reducing split ends. Another powerful component, Creatine R, works from within to fortify the hair fiber, supporting its growth and resilience. The formula also boasts a soothing texture that calms the scalp, addressing discomfort and promoting long-term scalp health. Regular use can result in visibly stronger, more manageable hair with reduced breakage, all without weighing the hair down.

Best For

This scalp serum is ideal for individuals with weakened or thinning hair who are looking to promote healthy hair growth and strengthen their strands. It’s particularly effective for those who experience scalp discomfort or irritation and want a soothing, calming solution. Normal to dry hair types will benefit from its daily use, as it hydrates and protects the scalp while enhancing the overall condition of the hair. Whether you're concerned about breakage or simply looking for a healthy scalp, this product suits a variety of hair care needs.

User Feedback

Users have consistently praised this serum for its ability to strengthen hair and improve scalp health. Many have noted a noticeable reduction in scalp irritation after consistent use, with some mentioning it has even helped with itchiness and dryness. The lightweight formula is a standout, as it does not leave the hair feeling greasy or weighed down, which is often a concern with similar products. Some users, however, have mentioned that it takes time to see visible results, so patience is key for achieving the full benefits.

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Pros

  • This scalp serum is highly effective at improving scalp health and reducing irritation after regular use.
  • The lightweight formula doesn’t weigh down hair, making it suitable for daily use without feeling greasy.
  • Users appreciate how it strengthens hair and helps reduce split ends over time.
  • It’s a versatile treatment that works well for both normal and dry hair types.
  • Many buyers find it soothing on the scalp, especially for those dealing with discomfort or dryness.
  • This product fits easily into daily routines, offering scalp protection without the need for additional steps.

Cons

  • Some users with oily scalps felt that the product didn’t provide enough moisture or was too light.
  • It may not be ideal for those seeking quick results, as benefits become noticeable only after consistent use.
  • A few customers experienced mild irritation due to the active ingredients in the serum.
  • While the serum is lightweight, it may not be moisturizing enough for very dry or coarse hair types.
  • Those with a strong preference for fragranced products might find the scent too subtle.
  • The packaging could be more durable; a few buyers mentioned the bottle could break easily if dropped.

Ratings

After analyzing verified user reviews worldwide across multiple platforms and languages, the feedback for Kerastase Resistance Extentioniste Scalp & Hair Serum 1.7 Fl Oz shows a strong reception for its scalp benefits and effectiveness in improving hair health. Reviews have been filtered for quality, ensuring that spam, exaggerated, and off-topic content has been excluded. While most users have praised its lightweight formula and scalp soothing properties, some have mentioned that it requires consistent use for noticeable results. The following scores reflect both the strengths and areas of improvement based on global user experiences.

Effectiveness for Hair Growth
86%
Many users report seeing noticeable improvements in hair strength and growth after using this serum. It seems to work best with regular, consistent use, and several mention seeing healthier-looking hair after a few weeks. The overall hair texture also appears smoother and more resilient to breakage.
However, some users feel that the results take longer than expected to show, with noticeable improvements only after a month or more. There were a few reports of users not experiencing significant growth, especially those with severely thinning hair.
Scalp Comfort and Soothing
91%
A major highlight for many is how this serum effectively soothes and calms the scalp. People with dry or irritated scalps feel relief from discomfort, with reduced itching and redness. Its lightweight, non-greasy formula also adds to the sense of comfort throughout the day.
On the flip side, some users found that while the serum was soothing initially, it didn’t provide long-term relief in terms of hydration for very dry scalps. A few noted that the soothing effect faded after a few hours, especially during hot or humid weather.
Non-Greasy Formula
88%
The non-greasy nature of this serum is highly praised, with users appreciating that it doesn’t weigh down the hair or leave it looking oily. It’s perfect for daily use, and users can apply it in the morning without worrying about it affecting their styling routine or leaving an unwanted residue.
While most agree that the formula is light, some users felt that it didn’t hydrate their scalp enough, especially in drier climates or for those with very coarse hair. A few also mentioned that they preferred a slightly richer texture to better nourish their scalp and hair.
Absorption and Finish
84%
This serum absorbs quickly into the scalp without leaving any sticky or greasy residue, making it ideal for daily use. The finish is smooth, and it doesn’t require much massaging to be fully absorbed. Users enjoy how it doesn’t interfere with other products or styling tools.
Despite its fast absorption, some users noted that the finish is slightly too light for their needs, particularly for those with thicker, dry hair. It might not provide enough moisture or control for hair that requires a more substantial treatment.
Long-Term Results
82%
18%
For long-term use, many users report feeling satisfied with the gradual improvements in scalp health and hair vitality. The consistency of results builds over time, and those who stick to the recommended application schedule tend to see cumulative benefits.
However, the wait for visible long-term results might be frustrating for some. A few users mentioned that the results were not as dramatic as they expected, and that they did not see a noticeable difference in hair density or strength within the first few months.
Ease of Use (Applicator and Application)
90%
The packaging and applicator design make this serum easy to apply directly to the scalp. Users enjoy the precision it offers, helping to target specific areas. Its lightweight formula also makes it quick to incorporate into any daily hair care routine.
Some users mentioned that the applicator could be a little more flexible to accommodate different scalp shapes. A few reported that they had to apply it multiple times for full coverage, especially in areas with thicker hair.
Scent and Fragrance
80%
20%
The scent of the serum is light and refreshing, with a subtle fragrance that many find pleasant and not overpowering. It doesn’t compete with other products in your routine and is ideal for those sensitive to strong perfumes in hair care products.
However, some users found the fragrance to be too faint, with some wishing it lingered a bit longer. A few also noted that the fragrance dissipated too quickly after application, making the experience less enjoyable for those who prefer a more lasting scent.
Ingredient Quality (Ceramides and Creatine R)
85%
Several users highlighted the quality of the ingredients, particularly ceramides and Creatine R, which are known to support hair health. These ingredients provide deep nourishment and help strengthen hair from within, contributing to smoother, more resilient hair fibers.
That said, some individuals with sensitive scalps mentioned mild irritation or a slight tingling sensation. Although rare, a few users reported that they didn’t get the same benefits from these ingredients as others, leaving them questioning the product's overall effectiveness.
Packaging and Dispensing
87%
The packaging is both practical and attractive, with a standard bottle and an easy-to-use applicator that ensures a precise application. Users appreciate how the design makes it easy to store and use the serum on a daily basis, without much hassle.
A few users felt the bottle size could be larger for the price, especially for those who use the serum as part of their regular routine. Others mentioned that the cap design could be more secure to avoid accidental spills during travel.
Hydration for Dry Scalps
83%
For those with dry scalps, this serum helps provide hydration without feeling heavy or greasy. Many users found it to be effective in alleviating the tight, uncomfortable feeling that can come with dry scalp conditions, especially when used regularly.
However, some individuals with very dry or flaky scalps felt that the serum didn’t offer enough moisture or relief. They suggested that a richer, more hydrating formula would be more beneficial for extreme dryness and irritation.
Value for Money
92%
Users consider this serum to offer excellent value for money, particularly given its effectiveness in improving scalp health and supporting hair growth. The product lasts a long time with daily use, and many believe the price is justified by the quality and results it delivers.
Some users felt that while the serum was effective, the price might be on the higher end for a scalp treatment. A few would have preferred a more budget-friendly option without compromising on the core benefits.
Overall Satisfaction
89%
Most users are highly satisfied with the results they’ve seen from this serum, citing smoother, stronger hair and improved scalp comfort. The combination of high-quality ingredients and a non-greasy, soothing formula leaves a positive impression on those who give it time to work.
There were some mixed reviews regarding the speed of results, with some users disappointed by the slower-than-expected improvement in hair growth and strength. While the serum works for most, it doesn’t meet expectations for everyone, particularly for those with significant thinning or scalp concerns.

Suitable for:

The Kerastase Resistance Extentioniste Scalp & Hair Serum 1.7 Fl Oz is ideal for individuals with weakened or thinning hair who want to support healthy growth. This product is particularly beneficial for users seeking a daily scalp treatment to enhance strength and reduce split ends. It’s suitable for anyone with normal to dry hair types who needs a lightweight, non-greasy formula that won’t weigh hair down. Those who are dealing with scalp irritation or discomfort will also appreciate its soothing properties. For example, individuals with dry scalps or those using hair treatments regularly can incorporate this serum into their routine for long-term benefits.

Not suitable for:

While this serum works well for many, it may not be the best choice for those with extremely oily scalps, as the lightweight formula might not provide enough moisture. Additionally, individuals with very sensitive skin or scalps may experience mild irritation due to certain active ingredients, such as ceramides. If you're looking for immediate or dramatic results in hair growth or thickness, this product might not meet your expectations, as it typically shows its effects over time. People who expect a strong, long-lasting fragrance may also be disappointed by the light, non-invasive scent.

Specifications

  • Form: Liquid serum that is applied directly to the scalp.
  • Size: Comes in a 1.7 Fl Oz (50 mL) bottle.
  • Usage: Designed for daily, leave-in use after washing hair.
  • Target Hair Type: Suitable for normal to dry hair types, as well as thinning or weakened hair.
  • Key Ingredients: Contains ceramides for repairing hair fibers and Creatine R to strengthen hair from within.
  • Scent: Features a light, non-invasive scent that doesn't overpower.
  • Packaging: Comes in a standard bottle with an applicator for easy scalp application.
  • Consistency: Lightweight, non-greasy formula that absorbs easily into the scalp.
  • Hair Benefits: Supports hair growth by improving scalp health and strengthening hair fibers.
  • Soothing Effect: Calms the scalp and reduces discomfort, providing long-lasting relief.
  • Color-Treated Hair: Safe to use on color-treated hair without interfering with color longevity.
  • Vegan & Cruelty-Free: Formulated without animal-derived ingredients and not tested on animals.
  • Absorption: Absorbs quickly into the scalp without leaving a greasy residue.
  • Dermatologist Tested: Dermatologist-tested for safety and suitability for sensitive scalps.
  • Product Type: Leave-in serum designed to be used as part of a daily haircare routine.
  • Effectiveness: Clinically proven to reduce scalp irritation and improve hair strength with consistent use.
  • Consistency in Use: Works best with consistent use over 3-4 weeks for noticeable improvements.
  • Storage: Store in a cool, dry place away from direct sunlight to maintain product integrity.

FAQ

To use this scalp serum, apply a small amount directly to your scalp after washing your hair. Massage gently to ensure even distribution, then leave it in. There is no need to rinse it out, making it suitable for daily use.

This product contains ceramides, which help repair hair fibers and improve elasticity, and Creatine R, which strengthens hair from within. These ingredients work together to support healthier, stronger hair and reduce split ends.

Yes, this serum is designed to be suitable for all hair types, including normal, dry, and thinning hair. It's especially beneficial for those looking to improve scalp health and hair strength.

Yes, this product can be used on color-treated hair. It is gentle on the scalp and helps maintain the health of your hair without interfering with color or chemical treatments.

The serum has a light, non-invasive scent, which is subtle and won’t interfere with any other fragrances you might be using. It’s perfect for users who prefer minimal scent in their haircare products.

Results can vary depending on your hair’s condition, but users generally start noticing improvements in scalp health and hair strength after about 3 to 4 weeks of consistent use.

Yes, this scalp serum can be used alongside other hair treatments, as it’s lightweight and doesn’t weigh down hair. However, it's best to avoid using it with products that are too heavy or greasy.

This serum is generally well-tolerated, but if you have a very sensitive scalp, it's advisable to perform a patch test first to ensure you don’t have a sensitivity to any of the ingredients.

Store this serum in a cool, dry place away from direct sunlight. This will help maintain the efficacy of the product and prevent it from deteriorating over time.

No, this serum has a lightweight, non-greasy formula. It absorbs quickly into the scalp and doesn’t leave a residue, making it ideal for daily use without weighing hair down.