Formulated for 4a, 4b, and 4c textures
Keratin treatment for black hair.
Not a relaxer. Not a generic formula that fails on textured hair. Professional keratin treatments engineered for the bond structure of Black hair — 4a, 4b, 4c. Formaldehyde-free. From roughly $56 per treatment at home versus $300–$500+ at a salon.
The problem
Most keratin treatments are not built for black hair.
The majority of keratin treatments on the US market are formulated for European and Asian hair textures. When applied to Black hair — especially 4b and 4c — they either fail to penetrate the tighter curl pattern, deliver patchy results, or over-process the hair because the chemistry is not calibrated for your bond structure.
Black hair has distinct characteristics: more disulfide bonds per strand, higher porosity, a flatter cross-section, and significant shrinkage that disguises true length. These are not flaws — they are structural features that require a treatment designed around them, not adapted from a formula built for someone else's hair.
On top of that, many Black women have experienced chemical relaxer damage — scalp burns, breakage, thinning. The last thing you need is another harsh chemical. That is why formaldehyde-free is not optional for this audience. It is essential.
For hair types
4A / 4B / 4C
Formaldehyde
Free
Results last
3–5 months
Cost per treatment
~$56
Know the difference
Keratin vs relaxer vs silk press vs Dominican blowout.
Keratin Treatment
- — Smooths without breaking bonds
- — Formaldehyde-free options available
- — Lasts 3–5 months
- — Controls result: frizz reduction to straight
- — Strengthens hair over time
Chemical Relaxer
- — Permanently breaks disulfide bonds
- — Uses lye or no-lye chemicals
- — Irreversible — only grows out
- — Can cause burns, breakage, thinning
- — Weakens hair structure
Silk Press
- — Temporary heat styling
- — Lasts until next wash day
- — Requires regular high heat
- — Cumulative heat damage risk
- — $65–$150 per salon visit
Dominican Blowout
- — High heat + roller set
- — Lasts about a week
- — Frequent reapplication needed
- — Heat damage over time
- — $35–$85 per visit
Keratin is the only option that smooths for months without breaking bonds or requiring repeated high heat.
Our top pick — Permanent smoothing
QIQI Hair Controller — Thick & Coarse.
The QIQI Hair Controller Thick & Coarse formula is specifically built for thick, coarse, and afro-textured hair. It uses a higher concentration of glyoxylic acid to penetrate the tighter bond structure of type 4 hair. The result is permanent smoothing that lasts up to 5 months.
You control the result. Fewer flat iron passes preserve more of your natural texture and volume — great for frizz reduction while keeping your curl pattern. More passes deliver a sleeker, straighter finish. This is not a relaxer — it does not break your bonds, and it does not damage your hair.
Formaldehyde-free. Designed for home use. One 150g bottle contains 3+ treatments — approximately $56 per treatment versus $300–$500+ at a salon.
Specialist option — Temporary smoothing
Nanokeratin Refortify Smoother.
The only keratin treatment in the Nanokeratin range engineered from the ground up for afro and tightly textured hair. Refortify smooths, strengthens, and locks in moisture without compromising your natural texture integrity. Results last 12–16 weeks and wash out gradually.
This is the best choice if you want to reduce frizz and improve manageability while preserving your natural curl pattern. The manufacturer states it is both formaldehyde-free and aldehyde-free. Available in 320ml and 1 litre professional sizes.
Quick comparison
QIQI Thick & Coarse vs Nanokeratin Refortify.
QIQI Thick & Coarse
Type: Permanent smoothing / straightening
Lasts: Up to 5 months
Result: From defined curls to fully straight — you control it
Reversible: Grows out over time
Cost per treatment: ~$56 (3+ treatments per bottle)
Home use: Yes — designed for it
Best for: Maximum value, lasting smoothing, and full control over the finish
Nanokeratin Refortify
Type: Temporary smoothing
Lasts: 12–16 weeks
Result: Smoothed, manageable texture with curl pattern preserved
Reversible: Yes — washes out gradually
Cost: From £279
Home use: Yes
Best for: Frizz reduction while keeping your natural texture
Not sure which one? Take the 60-second quiz for a personalized recommendation →
The big question
“Will keratin treatment straighten my black hair?”
This is the most common question, and the answer is: it can — but it does not have to. Unlike a relaxer, which gives you one result (straight, no going back), a keratin treatment like QIQI Thick & Coarse lets you choose your finish.
Want to keep your curls but kill the frizz? Use fewer flat iron passes during application. Your curl pattern stays intact, but shrinkage is reduced, frizz is gone, and your hair is more manageable day to day.
Want a sleek, straight finish? Use more flat iron passes with tighter sections. You will get a smooth, straight result that lasts until the treated hair grows out — up to 5 months.
Want something in between? You can achieve a stretched, elongated look that shows your true length without full straightening. Many women with 4c hair choose this option because it eliminates shrinkage while keeping texture and volume.
Nanokeratin Refortify takes a different approach — it smooths and strengthens while preserving more of your natural texture by design. If you want frizz control without any straightening, Refortify is the better pick.
Real numbers
How much does keratin cost for black hair?
Salon
$300–$500+
Per session in the US
Higher for type 4 hair (takes longer)
Atlanta, NYC, Houston, LA at the top end
Repeat every 3–5 months
QIQI at home
~$56
Per treatment (3+ per bottle)
Same professional formula
Permanent results up to 5 months
Up to 90% less than salon
Relaxer (for comparison)
$75–$200
Per salon visit
Repeat every 6–8 weeks (touch-up)
Cumulative damage over time
Irreversible bond breakage
QIQI Hair Controller — All formulas
Shop QIQI treatments.
We recommend Thick & Coarse for Black hair textures (4a, 4b, 4c). The Wavy & Curly and Thin & Delicate formulas are available for looser textures and finer hair.
From £129 · 150g
Hair Controller — Thick & Coarse
Formaldehyde-free permanent smoothing treatment for thick, coarse, and afro-textured hair. Softens disulfide bonds under heat for lasting frizz control — from defined curls to fully straight. QIQI Hair Controller results last up to 5 months.
Shop now →
From £129 · 150g
Hair Controller — Wavy & Curly
Permanently reduces frizz and enhances natural pattern definition — or delivers a smooth, controlled finish. Designed specifically for wavy and curly hair. Formaldehyde-free. Lasts up to 5 months.
Shop now →
From £129 · 150g
Hair Controller — Thin & Delicate
Formaldehyde-free permanent smoothing for fine, colour-treated, or delicate hair. Eliminates frizz and reduces volume without over-processing. QIQI Hair Controller safe for bleached and highlighted hair. Results last up to 5 months.
Shop now →Nanokeratin System — All smoothers
Shop Nanokeratin treatments.
Refortify Smoother is the specialist formula for afro and textured hair. Other Nanokeratin smoothers are available for different hair types and chemical histories.
Refortify Smoother — Afro & Textured Hair
From £279
Revive Smoother — Natural Hair
From £279
Refine Smoother — Colour-Treated Hair
From £279
Replenish Smoother — Blonde & Bleached Hair
From £279
Resmooth Hair Smoother
From £129
Retexture Hair Smoother
From £129
Rexten Hair Safeguard — Extensions
From £139
See the full Nanokeratin range including aftercare bundles →
Common questions
Keratin treatment for black hair — FAQ
What is the best keratin treatment for black hair?
QIQI Hair Controller Thick & Coarse is the best overall choice for Black hair. It is a permanent, formaldehyde-free keratin treatment specifically formulated for thick, coarse, and afro-textured hair. At roughly $56 per treatment (3+ treatments per 150g bottle), it is a fraction of salon prices. For a specialist temporary option, Nanokeratin Refortify Smoother is the only keratin treatment on the market engineered from the ground up for afro and tightly textured hair.
Does keratin treatment work on 4c hair?
Yes. Both QIQI Thick & Coarse and Nanokeratin Refortify are designed to work on type 4 hair, including 4a, 4b, and 4c textures. QIQI uses a higher concentration formula to penetrate the tighter bond structure of coarse, resistant hair. The key is using a treatment specifically formulated for your texture — generic keratin treatments designed for European hair will either fail to work or over-process 4c hair.
Is keratin treatment safe for African American hair?
Yes, when you use a formaldehyde-free formula designed for your hair type. Both QIQI Hair Controller and Nanokeratin System are completely formaldehyde-free. Unlike chemical relaxers that permanently break and reform bonds using sodium hydroxide or calcium hydroxide, keratin treatments work with your hair's natural structure. They do not cause the scalp burns, breakage, or long-term thinning associated with relaxers.
Keratin treatment vs relaxer for black hair?
Keratin treatments are significantly safer than chemical relaxers. Relaxers use strong alkali chemicals (lye or no-lye) to permanently break disulfide bonds — this weakens hair structure over time, causes breakage, and can burn the scalp. Keratin treatments like QIQI Hair Controller use glyoxylic acid to soften bonds under heat without breaking them. The result is smoother, stronger hair without chemical damage. You also control the degree of smoothing — from frizz reduction to fully straight — which relaxers cannot offer.
How long does keratin last on black hair?
QIQI Hair Controller Thick & Coarse delivers permanent results that last up to 5 months — the treated hair stays smooth until it grows out. Nanokeratin Refortify Smoother is a temporary treatment that lasts 12–16 weeks and gradually washes out. Using sulfate-free aftercare products extends longevity for both treatments.
Can I do keratin treatment on black hair at home?
Yes. QIQI Hair Controller was designed specifically for home use — no salon ventilation system required because the formula is completely formaldehyde-free. You need a clarifying shampoo, a hair dryer, a flat iron that reaches 230°C/450°F, and 2–3 hours. A step-by-step application guide is included with every order. At roughly $56 per treatment versus $300–$500+ at a salon, the savings are substantial.
Will keratin treatment straighten my black hair?
It depends on the treatment and your technique. QIQI Hair Controller Thick & Coarse gives you full control — you can achieve anything from reduced frizz and loosened curls to a fully straight finish by adjusting your flat iron passes. Fewer passes preserve more texture. More passes deliver a sleeker result. Nanokeratin Refortify smooths and reduces frizz while preserving more of your natural texture. Neither treatment is a relaxer — they work with your hair, not against it.
How much does keratin cost for black hair at a salon?
Salon keratin treatments for Black hair typically cost $300–$500+ per session in the US, with prices in cities like Atlanta, New York, Houston, and LA often at the higher end. Many salons charge more for textured and 4c hair because the process takes longer. At home, QIQI Hair Controller Thick & Coarse costs from $168 per bottle, which provides 3 or more treatments — roughly $56 per treatment. That is up to 90% less than a single salon visit.
Is keratin treatment better than a silk press for black hair?
A silk press is a temporary heat styling method — results last until your next wash day. A keratin treatment delivers lasting smoothing for months. QIQI Hair Controller Thick & Coarse results last up to 5 months, meaning you spend far less time and heat on daily styling. Repeated silk presses can cause cumulative heat damage, while a keratin treatment actually protects the hair shaft and reduces the need for daily heat styling.
Is keratin treatment better than a Dominican blowout?
Dominican blowouts use high heat and a roller set to temporarily smooth textured hair — results last about a week and require regular heat application. Keratin treatments deliver smoothing that lasts months, not days. QIQI Hair Controller Thick & Coarse gives permanent results for up to 5 months. You reduce daily heat exposure because your hair is already smooth, which means less cumulative heat damage over time.
Ships from USA · Free shipping over $175
Built for your hair. Not borrowed from someone else's.
Formaldehyde-free keratin treatments formulated for Black hair — 4a, 4b, 4c. From ~$56 per treatment at home. Ships from USA with free shipping on orders over $175.