Kerastase K Water hair treatment

Kerastase K Water is *the* next big hair trend promising shine like never before – but what is it?

1st June 2020 | Author: Victoria Woollaston-Webber

Almost all hair products promise to leave you with shiny, healthy locks but there’s one that – if reviews are to be believed – is changing the game: K Water.

K Water is actually the brand name of Kérastase’s in-salon treatment that uses so-called lamellar technology.

The technology traces back to a company called NeoPharm from South Korea which developed Multi-Lamellar Emulsion (MLE) – a mix of oil and water that mimics the “lamellar structure” found naturally in our skin and is responsible for its barrier and how it works.

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What Is Kerastase K Water?

Kérastase’s K Water lamellar treatment is based on lamellar technology and consists of lightweight molecules – up to 10 times smaller than those found in traditional conditioner and masques – which, when mixed with water form a topcoat, or barrier, on the surface of the hair.

This adds shine, acts as a barrier to protect your hair from pollution and damage and helps create a lightweight and fluid hair movement. What’s more, it works instantly and presents a flawless finish to your blow dry. 

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More specifically, lamellar structures are made up of fine, alternating layers of molecules that form an even bond with the skin or hair.

Lamellar gel structures emulsify cosmetic oils to form an invisible film around the active ingredient.

Described as a “suit of armour”, the lamellar treatment protects via ingredients inside the product while also supporting the penetration and action of the active ingredients into the skin and hair so they work throughout the day.

The effect obviously wears off unless topped up. Think of it as a moisturiser for your skin; moisturising once won’t keep your skin moisturised for good, you need to apply it regularly. The same goes for K Water.

Despite its name, K Water doesn’t actually contain any water. It uses an anhydrous formula of glycol, amino acids and other agents which makes it ideal if you’re trying to reduce the amount of water in your routine. You can learn more about waterless beauty in our clean beauty guide.

The agents are activated when they come into contact with water, which is why K Water is used on wet hair.

A mixture of so-called lipid compounds and cationic derivatives “rush” to your hair’s fibres, forming neat layers that give K Water’s smooth finish.

The actives automatically bind to the areas that need the most care, staying away from sections of fibres which are healthy and this results in a lighter lamellar treatment. Often, hair treatments and conditioners can weigh down the hair, causing it to look shiny but flat. 

How does the K Water treatment work?

Once your hair has been cleansed, a stylist applies K Water to your lengths and ends, replacing the need for a masque or conditioner, before instantly rinsing it off.

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The act of rinsing activates the molecules which bond to form ultra-fine topcoat on the surface of your hair and because it works instantly, it doesn’t add any time to your salon visit like a masque would.

Plus, it costs just £7 on top of your cut or blow dry. It’s currently available across the US and as an exclusive salon treatment in select Rush Salons in the UK as a salon. You can find your nearest here.

Obviously, with many of us on lockdown, going to a salon isn’t possible. A handful of sites sell Kerastase K Water for use at home – for around £30 a bottle – but reviews are not favourable. With some claiming that these sites are selling knock-off Kerastase products. As this is a product designed to be used in salons, we can’t recommend buying it for use at home. In the meantime, try one of our recommended best hair masks for damaged hair to tide you over until salons re-open.

Will K Water work on damaged hair?

Kérastase claims that K-Water suits all hair types because it mimics the natural structure found in the body rather than targeting specific areas or problems. However, if your hair is very damaged or coarse, Kérastase advises talking to one of their stylists about alternative treatments such as Fusio-Dose.


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