Safety note: Salon haircare is generally low-risk, but patch test leave-in products if you have sensitive skin, and rinse eyes immediately if shampoo makes contact. These recommendations are not medical advice. Consult a dermatologist for persistent scalp or hair concerns.
Kérastase and Redken both come from L’Oréal Professional. Both sit on salon shelves. Both cost more than drugstore hair care. But they’re not in the same league. Kérastase is the luxury line—thick textures, signature smells, prices that make you wince. Redken is the working brand—solid formulas, bigger bottles, about half the per-ounce cost. We compared them head-to-head in three rounds — everyday hydration, damage repair, and leave-ins — using formulas, current listings, and large volumes of owner feedback. Each brand brought its current hero products.
Quick verdict: Redken wins on value every time. The All Soft shampoo (around $29 for 16.9 oz) is the cheapest pick here. Kérastase wins on feel and specialized repair. The Résistance Bain Extentioniste earns its price if your hair’s genuinely trashed. Most people should mix brands: Redken for daily staples, Kérastase where it actually matters.
Quick Picks
Budget PickRedken All Soft Shampoo (16.9 oz)$29.45-$31.00as of Oct 11, 2026Read our take ↓
Best Everyday LuxuryKérastase Nutritive Bain Satin Shampoo$45.00as of Oct 11, 2026Read our take ↓
Best Bond RepairRedken Acidic Bonding Concentrate Shampoo$35.15-$37.00as of Oct 11, 2026Read our take ↓| Spec | Redken All Soft Shampoo (16.9 oz) $29.45-$31.00as of Oct 11, 2026 4.6 | Kérastase Nutritive Bain Satin Shampoo $45.00as of Oct 11, 2026 4.6 | Redken Acidic Bonding Concentrate Shampoo $35.15-$37.00as of Oct 11, 2026 4.6 | Kérastase Résistance Bain Extentioniste Shampoo $48.00as of Oct 11, 2026 4.6 | Redken One United Leave-In Conditioner $30.40-$32.00as of Oct 11, 2026 4.6 | Kérastase Elixir Ultime Refillable Oil $35.00as of Oct 11, 2026 4.6 |
|---|---|---|---|---|---|---|
| size | 16.9 fl oz | 8.5 fl oz | 10.1 fl oz | 8.5 fl oz | 5 fl oz | 1.01 fl oz (refillable bottle) |
| line | All Soft - dry, brittle hair | Nutritive - normal to dry hair | Acidic Bonding Concentrate - damaged hair | Résistance - damaged, brittle, overstressed hair | — | — |
| keyIngredients | Argan oil, Moisture Complex | Plant-based proteins | Citric acid, bonding care complex | Creatine R, ceramides, taurine | Coconut oil, Keracare | — |
| colorSafe | Yes, daily use | Yes | — | — | — | — |
| Rating | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 |
Prices change daily — tap Check Price for the current Amazon price.
Prices change daily — tap Check Price for the current Amazon price.
How We Evaluate
We compare both brands using live Amazon catalog data. Current prices, availability, bestseller ranks, verified storefronts. Kérastase sells through its own brand store. Redken ships from Amazon directly. Every product here is a current listing we checked at write time. No substitutes.
Round 1: Everyday Hydration - All Soft vs Nutritive
Redken All Soft Shampoo - Budget Pick
Redken All Soft Shampoo (16.9 oz)
All Soft is the shampoo that built Redken’s retail rep. It’s an argan-oil formula with the brand’s Moisture Complex. It cleans gently while making dry, brittle hair soft and manageable again. Color-safe, fine for daily use. The 16.9 oz bottle at around $29 makes it the cheapest per ounce in this whole comparison. By a lot.
What you lose versus Kérastase is the luxury feel. The lather is nothing special. The scent is fine but forgettable. What you keep is most of the actual performance.
Kérastase Nutritive Bain Satin Shampoo - Best Everyday Luxury
Kérastase Nutritive Bain Satin Shampoo
Bain Satin is Kérastase’s everyday hydration icon. It’s built around plant-based proteins that feed normal-to-dry hair while clearing buildup gently. The experience is where it pulls ahead: thick, silky lather, the unmistakable Nutritive scent, a satin-soft finish that feels like you just left the salon chair.
At around $43 for 8.5 oz, you’re paying about triple All Soft’s per-ounce rate. Whether that’s worth it is the whole Kérastase debate. It’s a fair yes if you care about the daily ritual.
Round 1 winner: Redken on value, no contest. All Soft gives you most of the hydration for a third of the price. Kérastase takes the experience crown.
Round 2: Damage Repair - Acidic Bonding vs Résistance
Redken Acidic Bonding Concentrate Shampoo - Best Bond Repair
Redken Acidic Bonding Concentrate Shampoo
Acidic Bonding Concentrate is Redken’s most-awarded recent line. The approach is pure chemistry: a citric-acid bonding care complex that rebuilds strength in hair wrecked by color, bleach, and hot tools. It helps salon color stick around longer. The formula is vegan and sulfate-free. At around $37 for 10.1 oz it undercuts every comparable bond-repair shampoo from luxury brands.
It’s concentrated. A little lathers way more than you’d expect. The scent is clean, not indulgent. For performance-per-dollar, it’s the strongest repair value here.
Kérastase Résistance Bain Extentioniste - Worth the Upgrade
Kérastase Résistance Bain Extentioniste Shampoo
Kérastase’s answer targets the fiber itself. Bain Extentioniste pairs Creatine R with ceramides and taurine to reinforce the internal structure of weakened hair. It zeroes in on split ends and breakage in long, overstressed hair. Even with the reparative load it rinses light—which matters if you’re washing fragile hair multiple times a week.
At around $46 for 8.5 oz it’s the priciest bottle here. Kérastase’s system logic applies: the matching Résistance masque is where the full effect shows up. For serious breakage on hair you’re trying to grow long, this is the one that earns the word upgrade.
Round 2 winner: Split decision. Redken wins for color- and bleach-damaged hair on value. Kérastase wins for breakage-prone lengths and split ends.
Round 3: Leave-Ins - One United vs Elixir Ultime
Redken One United Leave-In Conditioner - Best Multitasker
Redken One United Leave-In Conditioner
One United is a workhorse. It’s a 25-benefit leave-in spray that detangles, conditions, primes for styling, and blocks heat damage. Formulated with coconut oil and Keracare. No sulfates, no parabens, no heavy waxes. It works on every hair type and texture. At around $30 for 5 oz it replaces two or three separate bottles on your shelf.
The honest limit of any multitasker: each job is done well, not perfectly. A dedicated high-heat protectant still beats it for daily 400°F styling.
Kérastase Elixir Ultime Refillable Oil - Best Finishing Oil
Kérastase Elixir Ultime Refillable Oil
Elixir Ultime is Kérastase’s iconic finishing oil. Now in a refillable bottle made from 30%-recycled glass. One or two pumps on mid-lengths and ends gives you what the brand reports as 92% more shine and up to 10x smoother, stronger hair versus a non-conditioning shampoo baseline. Heat protection is built in for styling days.
At around $32 for 1.01 oz the price looks crazy. But you use it in single pumps and the refill system drops the long-term cost. As a pure finishing step, nothing Redken makes touches its polish.
Round 3 winner: Different jobs. One United is the practical daily multitasker. Elixir Ultime is the better finisher. Own both roles, whichever brand fills them.
Which One Should You Buy?
If you want one answer: build a Redken base and add Kérastase where it matters. Start with Redken All Soft for everyday washing—it’s the best value here—and add Acidic Bonding Concentrate if you’ve got color or bleach damage. Go Kérastase for the targeted wins: Bain Extentioniste for breakage-prone lengths. Elixir Ultime as the finishing touch that actually reads like a salon result.
For more salon-line matchups, see our Kérastase vs Olaplex comparison and our best bond builders beyond Olaplex roundup. Bleached hair should also visit our best hair masks for bleached and damaged hair guide.
FAQ
Are Kérastase and Redken made by the same company? Yes. Both are L’Oréal Professional Products brands. They’re positioned differently: Kérastase as the luxury flagship sold with a ritual-and-experience focus, Redken as the professional workhorse with larger sizes and lower per-ounce prices.
Is Kérastase really worth the higher price? For specific problems, often yes. Résistance’s fiber-reinforcement approach and the Elixir Ultime finish don’t have exact Redken matches. For general hydration, Redken gives you most of the result at a third of the cost. That’s why mixing brands is the smart play.
Which is better for color-treated hair? Both are color-safe across the board. Redken’s Acidic Bonding Concentrate has the edge for actively protecting color from fading while repairing bleach damage. Kérastase’s strength is bringing back softness and shine to color-stressed hair.
Can I mix products from both brands? Freely. Shampoo, conditioner, and styling products from different lines layer just fine. The “complete system” pitch from both brands is preference, not chemistry. Match each product to the job it does best.
Which lasts longer per bottle? Redken, easily. Its standard retail sizes run 10-17 oz versus Kérastase’s 8.5 oz, at lower prices. Kérastase narrows the gap only in concentrated formats like the refillable Elixir Ultime oil, where you’re using one or two pumps at a time.