Keratin Complex NKST Before and After: On the left, a model with frizzy hair ('Before') and on the right, the same model with smooth, straight hair ('After'). The NKST bottle is in the center.

California Eligible Keratin Treatment

Results last up to 5 months
Repairs damage
Blocks humidity and eliminates frizz
Increases manageability
Delivers luminous shine
Dramatically reduces blow-dry time

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Red open NKST box showing bottle and aftercare on white background

NKST Natural Keratin Smoothing Treatment System

Enjoy up to 5 months of smooth, shiny, manageable hair with our award-winning signature Natural Keratin Smoothing Treatment for sleek strands. This treatment is ideal for clients seeking smooth, shiny, and more manageable hair with maximum longevity.

Size 4 fl. oz. 16 fl. oz. 33.8 fl. oz.

Product variants

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Trusted by Stylists

Miranda M.
The results are amazing.. leaves the hair feeling like silk my clients love it!
Beatriz C.
The best smoothing treatment out there. My clients love it as much as I Do. Hair is always smooth and healthy
Stephanie B.
Absolutely loved this product! The results I received where beyond my expectations, I will definitely be switching over to this after using another well know brand!!
Sandra D.
Wonderful product leaves the hair completely shiny