The Top 5 Kérastase Products for Extensions

You know that moment when your extensions look insane leaving the salon… and then real life tries to humble you? Wind. Hoodies. Sleeping like a feral starfish.

Extensions don’t need more drama. They need slip, hydration, and protection—the holy trinity to keep your hair looking fresh at week 6.

So if you’re wearing extensions (or you’re about to), here are the top 5 Kérastase products we love at Muse to keep your hair soft, glossy, and easy to manage, without wrecking your investment.

1. Nutritive 8H Magic Night Serum

This is your “wake up pretty” product. You smooth it on before bed, and it helps keep your lengths hydrated overnight—plus it’s designed to help protect hair from pillow friction and reduce frizz while you sleep.

Why it’s extension-girl gold: Extensions don’t get natural oils from your scalp like your real hair does, so the mids + ends need extra love. This serum gives you that cushiony softness so you’re not waking up tangled and cranky.

How to use (the Muse way): Before bed, apply a small amount to mid-lengths + ends, brush through gently, then do a loose braid or low pony with a silk scrunchie.

2. Elixir Ultime L’Huile Original Hair Oil (Refillable)

If you want instant shine and that smooth, “my hair behaves” feeling—this is the one. It’s lightweight, helps control frizz, boosts shine, and also offers heat protection up to 450°F.

Why it’s amazing for extensions: It makes your natural hair and your extensions blend like a dream—especially at the ends where things can start looking dry or separated.

How to use: 1–2 pumps on mid-lengths + ends. Use it on damp hair before blow-drying, and/or as your finishing touch when you want that glossy, expensive vibe.

3. Gloss Absolu Bain Hydra-Glaze Shampoo

This shampoo is a high-shine cleanse that helps remove buildup and is formulated with ingredients like hyaluronic acid + glycolic acid (aka: shine + smooth energy).

Why it’s extension-safe: Buildup is not your friend. It can make your scalp feel heavy and your hair feel “sticky,” which can lead to more tangling around your wefts. A good cleanse keeps everything fresher, longer.

How to use: Focus on your scalp. Let the lather glide through your lengths—no aggressive scrubbing on the extensions.

4. Gloss Absolu Insta Glaze Conditioner

This is the “soften + detangle + smooth” step that makes brushing way easier. It’s made to hydrate, eliminate frizz and blend your natural texture seamlessly with your extensions. 

Why extensions love it: Smoothing, high-shine,  frizz free extensions—what’s not to like?

How to use: Apply mid-lengths + ends only. Let it sit a couple minutes, then rinse well. Brush starting at the ends and work up like the grown-up you are.

5. Gloss Absolu Anti-Frizz Glaze Milk (Leave-In Spray)

This spray is a multi-purpose hero: detangles, hydrates, smooths, helps with blow-dry, and protects from heat + humidity.

Why it’s a non-negotiable for extensions: It helps keep your hair from turning into a fluffy frizz cloud, and it makes styling easier—especially if you heat style.

How to use: Spray on damp hair (mid-lengths + ends), brush through, then blow-dry. Bonus points if you sleep with dry hair and a loose braid.

Your extensions deserve the good stuff

You didn’t invest in hair just to ruin it with random drugstore products. The right routine keeps your extensions softer, shinier, and easier to manage between appointments. Full stop.

Come grab your Kérastase at Muse Salon

Swing by Muse Salon and we’ll help you build the perfect extension routine. And don’t forget: you get 10% off your entire product purchase the day of your appointment.

Your hair called. She wants her products.