K. Fiber Repair Acidifying pH 3.0 Treatment

Professional use only. This product is sold exclusively to licensed cosmetology professionals. A verified Beauty Pro account is required to purchase.

Bleach and color leave hair alkaline, with the cuticle swollen open and chemical residue still sitting in the fiber. That's why hair feels rough and porous straight out of a service, and why color starts fading before the client's next appointment.

Acidificante pH 3.0 is the correction. Designed for professional hairdressers, it realigns the cuticle, neutralizes chemical residue, and helps prevent oxidation — while delivering moisture, strength, smoothness and shine. It's the step between the service and the blow-dry.

Made in Brazil, where humidity, sun, and salt make hair repair a daily science rather than a seasonal fix.

What it does

Returns hair to an acidic pH after color, bleach, or chemical services
Helps realign and seal the cuticle for a smoother surface
Neutralizes chemical residue left behind by the service
Helps prevent oxidation in freshly processed hair
Offers UV and thermal protection
Boosts shine and light reflection
Leaves hair softer, more elastic, and easier to comb

Key ingredients you'll love

pH 3.0 Acidifying System — glycolic and lactic acids counter the alkalinity a chemical service leaves behind
Hydrolyzed Keratin Protein — amino-acid rich, helps strengthen and repair while improving manageability
Hydrolyzed Silk Protein (Sericin) — absorbs into the fiber to improve moisture balance, softness, and elasticity
Hydrolyzed Wheat Protein — helps strengthen the shaft and minimize breakage while adding shine and body
Creatine — strengthens hair structure and enhances elasticity in chemically treated hair
Hyaluronic Acid — a humectant that attracts and holds moisture, improving texture and reducing frizz
D-Panthenol (Provitamin B5) — boosts hydration, manageability, and shine
Shea Butter (Butyrospermum Parkii) — rich in fatty acids; deeply hydrates, softens, detangles, and smooths

Rounded out with castor oil, coconut oil, palm kernel oil, soybean seed extract, and rice extract.

Built for the backbar

The finishing step after color, bleach, and highlights
After chemical smoothing and other alkaline services
Porous hair that feels rough or grabby out of the bowl
Color clients whose color fades faster than it should
Available in a 1 L backbar size and a 300 ml spray for the station

How to use

After shampooing, spray strand by strand through the hair.
Leave on 3 minutes.
Rinse and finish as desired.

Pro tip: Start at the mid-lengths and ends. That's where hair is most porous and where the pH swing does the most damage.

Pairs with the K. Fiber Reconstructing Repair Shampoo and Conditioner to complete the reconstruction system.

Not a Beauty Pro yet? Licensed stylists get wholesale pricing, professional-only products, and early access to new launches. Apply for your Beauty Pro account.

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K. Fiber Acidifying pH 3.0 Treatment