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Sulfate Free Shampoo for Keratin Treated Hair

Illustration of a sleek straight hair swatch, a flat iron and a paddle brush — Illustration (AI-generated)

Short answer: we found 15 products that pass. Good ones to start with: Amika Bust Your Brass Cool Blonde Strength Repair Shampoo, Amika Hydro Rush Intense Moisture Shampoo Moisturizing Shampoo, Amika Mirrorball Shine Shampoo. Brands that sell keratin and smoothing treatments usually tell you to switch to a sulfate-free shampoo afterwards, and many also suggest avoiding added salt. Everything here is sulfate-free, and the brand's own page says it's keratin-safe or fine after a smoothing treatment. The table shows whether sodium chloride (salt) is on the list too.

15 products · last checked 2026-10-25

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After a Brazilian Blowout or other smoothing treatment

A Brazilian Blowout is a smoothing treatment. Every product here says on its own page that it is keratin-safe or safe after a smoothing treatment. None of them names the Brazilian Blowout brand specifically, so check with your stylist.

All 15 products

Product	Main cleansers	Fragrance-free?	Salt-free?	Source
Amika Bust Your Brass Cool Blonde Strength Repair Shampoo	Sodium C14-16 olefin sulfonate, Cocamidopropyl betaine	No	Yes	Brand page
Amika Hydro Rush Intense Moisture Shampoo Moisturizing Shampoo	Coco-glucoside, Sodium cocoyl isethionate (SCI)	No	No	Brand page
Amika Mirrorball Shine Shampoo	Cocamidopropyl betaine, Sodium cocoyl isethionate (SCI)	No	No	Brand page
Amika Normcore Antioxidant Signature Shampoo	Cocamidopropyl betaine, Sodium cocoyl isethionate (SCI)	No	No	Brand page
Amika The Kure Strength Repair Shampoo	Sodium C14-16 olefin sulfonate, Cocamidopropyl betaine	No	Yes	Brand page
Amika The Protector Color Protect + Strengthen Shampoo	Sodium C14-16 olefin sulfonate, Cocamidopropyl betaine	No	No	Brand page
Bondi Boost Volumising Shampoo	Cocamidopropyl betaine, Decyl glucoside	No	No	Brand page
Kristin Ess Curl Shampoo	Sodium C14-16 olefin sulfonate, Cocamidopropyl betaine	No	Yes	Brand page
Kristin Ess Extra Gentle Shampoo	Cocamidopropyl betaine, Coco-glucoside	No	No	Brand page
Kristin Ess Pre-Shampoo Rinse	Decyl glucoside	No	Yes	Brand page
Kristin Ess Purple Shampoo	Sodium C14-16 olefin sulfonate, Cocamidopropyl betaine	No	No	Brand page
Kristin Ess Shampoo	Lauryl glucoside, Sodium cocoyl isethionate (SCI)	No	No	Brand page
Kristin Ess Strengthening Shampoo	Sodium C14-16 olefin sulfonate, Cocamidopropyl betaine	No	Yes	Brand page
Olaplex Nº.4P Blonde Enhancer™ Purple Toning Shampoo	Sodium C14-16 olefin sulfonate, Cocamidopropyl betaine	No	No	Brand page
OUAI Detox Clarifying Hair Shampoo	Sodium C14-16 olefin sulfonate, Cocamidopropyl betaine	No	No	Brand page

Questions

What is the best sulfate free shampoo for keratin treated hair?

There's no single best one. All 15 listed here have no sulfates on the ingredient list, and the brand describes each as suited to this use. Start with the ones checked on the brand page, then compare cleansers and fragrance.

Does salt matter after a keratin treatment?

Several treatment brands advise avoiding sodium chloride as well as sulfates. The table shows which products list it, so you can decide.

How do I know a shampoo is really sulfate-free?

Read the ingredient list, not the front label. Look for any ingredient ending in 'sulfate' (lauryl, laureth, coco-sulfate and so on). Sulfonates and sulfosuccinates are different ingredients.

Do you test these products?

No. We check ingredient lists and what the brand says the product is for, not how it performs.