makes the hair like silk. it definitely makes them oily faster but that's logical since it doesn't have salts and it doesn't "open" the hair to clean it. I use it even without having done keratin! perfect scent

It saved my hair, I had done keratin months ago and I had bought the gentle one, when the keratin wore off the shampoo continued to make my hair smooth as if I had used a straightener. It lasts a long time even though I wash my hair twice every time and it smells very nice. Also, I have fine hair with dry ends and an oily scalp and it has helped me a lot with the oiliness compared to other shampoos that made my hair greasy in one day

Unfortunately, it didn't suit my hair. I have very dry hair and in 2 days it makes it oily and I need to wash it. The scent is perfect for me. I don't know if it does what it promises because I used it while I had a keratin treatment. It maintained it, my hair was soft, completely straight until the second day when it became very oily. A tip is to comb it somehow, it takes away some of the oiliness.

The shampoo is the best I have ever tried. With this shampoo, my hair only needs washing every 4 days, whereas with other commercial shampoos it needs washing every 2 days. It helped a lot with frizz. It doesn't have sulfates and is very gentle on the skin (often other shampoos cause me dryness, but with this one I had no issues). Additionally, it is quite thick, so only a small amount is needed for each wash - the 250mL lasted 6 months. When I bought it I was skeptical because of its price but I was so satisfied that I will definitely buy it again.

The shampoo comes in two versions. The GENTLE version (it's written on the packaging) is for hair with keratin. I emphasize this because I saw comments that the shampoo is not suitable for hair with keratin, and that's wrong; you just need to choose the gentle version. It smells nice, helps maintain the keratin, and is not heavy, at least for my hair, which is relatively thick. The quantity is small for the price, but more or less, everything is like that.

This product along with the extensionist is the best I have used on my hair..
It leaves it soft, helps with breakage, makes it shiny and has a wonderful scent!
I recommend it with my eyes closed!

In combination with all the products from the same line (mask and heat protection), there is an effect on the softness of the hair. As for frizz, it makes a very small difference in addressing it. I have only seen a significant reduction in frizz with the use of the Fusio Dose Booster from the same line.

The shampoo is very good! It lathers, cleans the hair, and leaves it soft and straight! The only problem is that after 3 months of use (3 times a week) I now have itching on the scalp..

Excellent product, much better than the Premiere line I had before.
It maintained the keratin perfectly all summer with daily, continuous use.
It noticeably stopped hair loss and strengthened the excessively thin, sensitive, and constantly frizzy hair.

It is the only shampoo I have been using for 4 years now! Especially if you have had a keratin treatment, having tried dozens, I can say that it is the only one that maintains the treatment in the hair, cleans them thoroughly, and smells nice. I highly recommend it.

I give it 3 stars for its price compared to its quality and, consequently, because it makes the hair greasy in 2 days!!! Did anyone else notice this or is it just me?

The smell of it reminds me of that summer scent after coming back from the beach, I don't know if there is something similar in the scent of sunscreen and it reminds me of that, otherwise it's an okay shampoo, nothing crazy but it's not bad.

Although it does a very good job, I think equally good quality can be found in a cheaper shampoo. Do not expect miracles or the ultimate product, but it does what it promises.

a good quality shampoo, since i'm using this shampoo my hair turn to be softer and i see my hair transform day by day and i haven't bought any thing els since

The reason I give it 1 star is because it's not worth the money. It does exactly what a €5 OGX shampoo does. No difference. It has a nice scent, but it's very expensive for both the amount and what it offers! Disappointed with Kerastase.

The best shampoo I have ever tried - my holy grail. Having particularly unruly hair that tends to frizz, I resorted to the solution of keratin treatment at the hair salon, which besides its cost, did not have satisfactory lasting results. At some point, I came across this shampoo and since then I haven't bought any other! It noticeably smooths the hair, I come out of the shower and after using the cream from the same line and blow-drying, my hair doesn't frizz and straightens in 10 minutes! I highly recommend it without hesitation!

The only reason I would want it again is for its smell and the feeling of cleanliness it definitely provided. It left my hair dry (even though I have oily skin) and dehydrated when I applied water, while with other shampoos I didn't feel the need to use a mask-conditioner and they also had sulfates.

It really creates a lot of foam with a small amount and leaves the hair moisturized and smooth. However, the scent it leaves is unpleasant, to the point where I can smell it even in my sleep and it bothers me. What a shame.

The best sulfate-free product I have tried. It leaves the hair soft unlike most others. I use it on hair that has undergone keratin treatment and it is one of the most suitable for me.

It is good, it does what it promises, especially after a keratin treatment that protects it as it does not have sulfates, but it made my hair somewhat oily very quickly and I felt that it did not rinse out easily.

Simply excellent. I have very coarse hair and have been doing keratin treatments for years, but I haven't found any shampoo that gives this result. The amount you consume is really smaller compared to other similar products, so it's worth its price in this aspect.

I have a lot of hair, thick strands, and I have done keratin, dye, and balayage. I use a minimal amount, about the size of a hazelnut, and I liquefy the shampoo in my palms with water and then wash myself (2 hands). Very good result, and the 250ml bottle lasts me as long as 5 liters of cheap shampoo. Simply an amazing product!

It leaves a wonderful feeling and a wonderful scent on the hair. I buy it for the second time, however, I think that when the bottle is finished, it is good to change it until the (whichever) alternative is finished and then we take it again (maybe continuous use creates some flakes)

I have done keratin treatment and I bought it for this reason! Nice product. It creates rich foam and has a nice scent. Expensive but leaves the hair moisturized but not greasy. I have a lot of long hair and it has pleased me because my hair is difficult to wash (the first hand usually doesn't usually foam... or it foams a little). It's worth its money.

In my hair, it did nothing to combat frizz. It has an excessively strong scent, to the point of being nauseating. I would not purchase it again.

I bought this specific shampoo as I have done keratin on my hair. It has a wonderful scent, doesn't weigh down the hair, while deeply cleansing them. Overall, I am a fan of all kerastase products and in combination with the maskeratine mask, the result is excellent!
(+ use the oleo relax discipline leave in for frizz control and the hair only needs simple drying and it is perfect)

It doesn't do much in terms of frizz control, but its smell is amazing and it leaves hair soft, smooth, and shiny!

It really helps with frizz and smooths the hair. It is sulfate-free, ideal for hair that has undergone keratin treatment, and it also lathers, which I have never encountered in other sulfate-free shampoos. I have already purchased it 3 times and I am very satisfied.

Excellent, it does a very good job on thick hair and lasts a long time because it makes amazing foam. I highly recommend it and the mask.

Indeed, it is worth it, it has the best scent, gives a feeling of cleanliness while not having SLS, it foams with a small amount, I will definitely buy it again!