Best-selling, sulfate-free leave-in treatment for strength repair in 1 use
A sales or award claim. It says nothing about what is in the bottle.
—
Stated by brand
Popularity, not performance.
Sizes & containers
5.1 fl oz (150 ml) · $30.95 at one store
Redken
Acidic Bonding Concentrate Leave-In Treatment
Heat protectant / Lotion, heat-protecting
- Heat protectant
- lotion
- Also a leave-in
- Sulfate-free
- Protein-free
- Not cruelty-free · PETA-listed
Size5.1 fl oz (150 ml)usual store size · 2 sizes
Price$30.95seen at one store · 5.1 oz
Price / oz$6.94/ozat 5.1 oz
Where to buy4 stores · $30.95–39.00
Add it to your products. We’ll tell you if it’s ever recalled.
Scent:
The ingredient list declares fragrance. What it smells of is not stated, and we do not guess.
Manufacturer page: redken.com
Personal fit
Is this right for you?
Complete the consultation to see how well this product fits your hair and your goals. With 6,000+ products in our library, we can match you to the right ones.
- About 20 minutes, and your answers save as you go.
- Every product matched against your hair across the 20 factors we check.
- A personalized routine built around your schedule, styling habits, and local weather.
- Find products that do the same job at a lower cost.
- Your goals, scalp, damage history, water, budget, and scent preferences all shape your plan.
$49 with 60 days of follow-up questions and plan updates
$99 with 12 months. Pay once; the year renews only if you choose.
Factor
Your profile
Fit
Best for hair types
Straight–Curly
Not in your profile
Moisture level
Low
Not in your profile
Heat protection
High
Not in your profile
Slip / detangling
High
Not in your profile
Weight on hair
Medium
Not in your profile
Fragrance
Prominent
Not in your profile
Protein
None
Not in your profile
Silicone / wax buildup
High
Not in your profile
Clarifying wash needed
Moderate
Not in your profile
Parabens / preservatives
None of these listed
Not in your profile
Show all 20 factors we check
The rest of what your plan weighs on this product.
Essential oils
None listed
Not in your profile
Fast-drying alcohol
None
Not in your profile
Vegan / cruelty-free
Not cruelty-free · PETA-listed
Not in your profile
Animal-derived ingredients
Not yet verified
Not in your profile
Heavy humectants
Not heavy
Not in your profile
Hard-water defence
None
Not in your profile
UV filter
None listed
Not in your profile
Ingredient list
25 ingredientsAbout average
Not in your profile
Price tier
Salon
Not in your profile
Where to buy it
TargetOne channel
Not in your profile
The consultation builds your hair profile, checks every factor in this table against it, and tells you where this product fits or what to use instead.
Start your consultation$49 once, with 60 days of follow-up questions and plan updates. Nothing renews, and you never have to buy a product.
Your avoid-list
Same job for less elsewhere
$6.94/oz at 5.1 oz, more than 84% of the 891 heat protectants , which mostly run $1.42–5.78/oz.
Great for
Heat stylingthe brand states protection to 450°F
Protein-sensitive hairthat stiffens when protein is added
Maximum slipfor hair that tangles the moment it is wet
Very dry hairno fast-drying alcohol in the list
A wide range of haira middle-of-the-range weight
Maybe skip if
this product has a scent
Curly-method routinesthese silicones need a detergent to remove
Vegan and cruelty-freeour record does not support both claims here
Tight budgetsit sits in the upper price tiers
Picking it up locallywe’ve only seen it sold in one channel
What the formula actually does
Read from the label, not the marketing
Each row says where it comes from: F means we derived it from this product’s own ingredient list, S means it is a claim the brand makes that the formula neither confirms nor contradicts.
Heat protection
Stated to 450°F
The brand states a protection temperature. That is a label claim, not a measurement.
Weight on the hair
Medium
Middle of the range: noticeable on fine hair, light on coarse hair.
Slip and detangling
High
Conditioning agents sit high in the list, so this is a detangling formula.
Needs detergent to remove
Yes
Water-insoluble silicones or waxes: a detergent wash is what removes them.
Water-binding (humectants)
Low
Humectants appear, but low enough to be a minor part.
Fast-drying alcohol
None
No fast-drying alcohol in the list.
Fragrance
Prominent
Fragrance is in the first eight ingredients, so it makes up a larger share of the formula.
from the formula
stated by the brand
reported by reviewers
Scale: 1 dot low · 5 dots high, within this product type.
Ingredients that matter
The ingredients that change a decision
The workhorse ingredients, plus anything lower down that changes a decision. The chips name what an ingredient does. They are not safety scores, and no ingredient here is rated good or bad on its own.
| Ingredient | What it does | Why it matters | Chip |
|---|---|---|---|
| WaterAqua/Water/Eau | solvent | The base everything else is dissolved in | Neutral |
| Dimethicone | silicone | Spreads heat across the strand | Buildup |
| Cetearyl Alcohol | fatty alcohol | Thickens and conditions (not a drying alcohol) | Softens |
| Amodimethicone | silicone | Spreads heat across the strand | Buildup |
| Phenoxyethanol | preservative | Keeps the product from spoiling | Stabilizes |
| Polyquaternium-37 | conditioning agent | Adds slip, lower in the list | Detangles |
| Dimethiconol | silicone | A little heat-spreading smoothing | Buildup |
| FragranceParfum/Fragrance | fragrance | The scent | Fragrance |
| Limonene | fragrance | The scent | Fragrance |
| Linalool | fragrance | The scent | Fragrance |
| Citronellol | fragrance | The scent | Fragrance |
| Citral | fragrance | The scent | Fragrance |
What the list leaves out, and what it carriesThe list carries no sulfates or drying alcohols. No protein: a moisture formula, not a repair one. Fragrance is on the label. Water-insoluble silicones that need a detergent wash to remove.
Full ingredient list (25)
In the US, ingredients above 1% are listed from most to least. Below 1% they can appear in any order. Each note keeps three things apart: what the ingredient generally does, its role in this type of product, and what its position can tell you.
-
1
Water
· Aqua/Water/Eau
General function
The base of almost every rinse-off and cream hair product. It carries everything else and is normally the first ingredient on the label.
Leading ingredientListed in the first three ingredients, it is likely a structural part of this formula.
- solvent
-
2
Dimethicone
General function
The most common conditioning silicone. It coats the strand for shine, slip, and frizz control, and needs a detergent (not just water) to wash out.
Leading ingredientListed in the first three ingredients, it is likely a structural part of this formula.
May suitClimate-sensitive or frizz-prone hairA surface film slows how quickly humidity reaches the cortex, which is what limits swelling-driven frizz in damp air.
May suitFrizz-prone, damaged, or high-friction hairLays a smooth film along the cuticle, which lowers combing friction and flattens the surface irregularities that read as frizz.
May not suitBuild-up-sensitive routinesDimethicone does not disperse in water. On a routine that skips detergent it stays on the hair and accumulates wash after wash.
- silicone
- emollient
- conditioning agent
-
3
Cetearyl Alcohol
General function
A waxy fatty alcohol - nothing like drying alcohol. It gives conditioners their body and leaves a soft, smoothing film on the hair.
Leading ingredientListed in the first three ingredients, it is likely a structural part of this formula.
PubChemMay suitDry, coarse, or high-porosity hairThe waxy solid that gives a conditioner its body. It deposits a soft lubricating layer, which is most of what makes hair feel smooth after rinsing.
May suitFrizz-prone, damaged, or high-friction hairDeposits with the cationic conditioners and helps them lie flat along the strand, which is where the detangling actually comes from.
DependsFine or easily flattened hairNear the top of a conditioner it is doing most of the conditioning, and most of the weighting, at the same time.
- fatty alcohol
- emollient
- thickener
-
4
Amodimethicone
General function
A silicone modified to stick where hair is damaged, so it smooths selectively instead of coating everything. It resists rinsing more than plain dimethicone.
Supporting ingredientListed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.
International Journal of TrichologyMay suitClimate-sensitive or frizz-prone hairA surface film slows how quickly humidity reaches the cortex, which is what limits swelling-driven frizz in damp air.
May suitFrizz-prone, damaged, or high-friction hairAmino-functional silicone carries a positive charge, so it binds where the cuticle is worn rather than coating evenly. Damaged areas get most of it.
May suitMaximum-hold stylingFilm formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.
- silicone
- conditioning agent
- film former
- ▾Below about here, the order stops meaning much. These are usually used at 1% or less.
-
5
Phenoxyethanol
General function
The most common modern preservative; it keeps the product free of bacteria and mould. It sits well below 1% of the formula.
Estimated lower-concentration zonePubChemIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
- preservative
-
6
Polyquaternium-37
General function
A thickening polymer that gives creams and curl products their bounce and helps them cling to the strand.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
May suitCurls or waves needing flexible holdCationic polymers hold a curl loosely and stay soft, which is why they turn up in definition products rather than firm-hold ones.
May suitFrizz-prone, damaged, or high-friction hairA cationic polymer stays on the hair through rinsing, which is what keeps static and combing friction down after the wash.
May suitMaximum-hold stylingFilm formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.
- conditioning agent
- film former
- polymer
- thickener
-
7
Dimethiconol
General function
A high-shine silicone often paired with dimethicone for a smoother, glossier finish.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay suitClimate-sensitive or frizz-prone hairA surface film slows how quickly humidity reaches the cortex, which is what limits swelling-driven frizz in damp air.
May suitFrizz-prone, damaged, or high-friction hairLays a smooth film along the cuticle, which lowers combing friction and flattens the surface irregularities that read as frizz.
- silicone
- emollient
-
8
Fragrance
· Parfum/Fragrance
General function
An undisclosed blend of scent ingredients. Regulations let it stay unlisted, so a fragrance-free product is the only way to be certain what is not in it.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
May not suitFragrance-sensitive routinesDeclared fragrance. On a fragrance-sensitive routine this is the line that decides it, wherever it sits on the label.
- fragrance
- declared fragrance
-
9
Propylene Glycol Dicaprylate/Dicaprate
General function
A light, dry-feeling ester that spreads other ingredients and softens without a greasy finish.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
May suitFine or easily flattened hairA light emollient: it softens the surface with noticeably less weight than an oil or a butter.
May suitFrizz-prone, damaged, or high-friction hairSpreads thin and lowers friction between strands without the heaviness of a fixed oil.
- light ester
- emollient
-
10
Trideceth-5
- emulsifier
-
11
Steareth-20
- emulsifier
-
12
Cetyl Hydroxyethylcellulose
General function
A cellulose thickener with a fatty tail, so it thickens and leaves a conditioning film at once.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
May suitCurls or waves needing flexible holdA polysaccharide film stays softer than a synthetic one as it dries, which is what leaves a curl defined but still able to move.
May suitFrizz-prone, damaged, or high-friction hairA soft film binds neighbouring strands together, which is most of what helps flyaways lie down.
May not suitMaximum-hold stylingGum films stay soft. A style that needs firm fixation usually wants a synthetic polymer doing the holding.
- gum
- thickener
- film former
-
13
Glycerin
General function
Glycerin, also called glycerol, attracts moisture and mixes completely with water.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
Scientific ReportsMay suitDry, coarse, or high-porosity hairHigh-porosity hair loses water fast; a humectant holds some of it in place for longer than the wash itself would.
May suitVery dry or highly damaged hairBinds water into the outer layers of the strand, and water is what makes dry hair flexible again rather than brittle.
DependsClimate-sensitive or frizz-prone hairWater moves both ways. Measured across concentrations, glycerin solutions give water up in some conditions and take it from the air in others. What it does for you depends on how much of it is there and on the air around it.
- humectant
-
14
Citric Acid
General function
Used to bring the product to a slightly acidic pH, which helps the cuticle lie flat. It is almost always near the end of the list.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
International Journal of TrichologyMay suitBuild-up-sensitive routinesHolds hard-water minerals in solution so they rinse away instead of depositing on the hair.
May suitFrizz-prone, damaged, or high-friction hairThe acid side of pH adjustment, and the reason it matters is measured: alkaline formulas raise the fibre's surface negative charge, increase friction between strands and lift the scales, while lower-pH ones do the reverse.
May suitGray, silver, or brass-prone hairWhere a warm cast comes from water minerals rather than from the hair itself, holding those metals in solution is what removes it.
- pH adjuster
- hard-water chelator
-
15
Limonene
General function
A citrus-smelling fragrance component that EU rules require to be named separately because some people react to it.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.
- fragrance
- named fragrance allergen
-
16
PPG-1 Trideceth-6
- emulsifier
- solubilizer
-
17
Trideceth-10
- emulsifier
- solubilizer
-
18
Sodium Hydroxide
General function
A strong base used in trace amounts to raise pH; fully neutralised in the finished product.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
International Journal of TrichologyDependsFrizz-prone, damaged, or high-friction hairThe alkali half of a pH-adjusting pair, used in small amounts to bring a formula up to its target rather than to make it alkaline. Alkaline conditions raise the fibre's surface charge and lift the scales — but the finished pH is not on the label.
- pH adjuster
-
19
Chlorhexidine Digluconate
- preservative
-
20
Sorbitan Oleate
- emulsifier
-
21
Acetic Acid
General function
Vinegar acid, used in tiny amounts to bring the formula to an acidic pH so the cuticle lies flat.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemDependsFrizz-prone, damaged, or high-friction hairpH adjusters are how a formula is brought to a chosen acidity, and an acidic formula keeps the cuticle lying flatter than an alkaline one. Which way this one moves the pH depends on the formula, and the finished pH is not on the label.
- pH adjuster
-
22
Linalool
General function
A floral fragrance component listed separately as a recognised contact allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.
- fragrance
- named fragrance allergen
-
23
Citronellol
General function
A rose-like fragrance component named separately as a recognised allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.
- fragrance
- named fragrance allergen
-
24
Citral
General function
A lemon-scented fragrance component listed separately as a recognised allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.
- fragrance
- named fragrance allergen
-
25
Eugenol
General function
A clove-scented fragrance component listed separately as a recognised allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.
- fragrance
- named fragrance allergen
What the whole list adds up to
- 6 fragrances
- 5 emulsifiers
- 5 named fragrance allergens
- 4 emollients
- 3 silicones
- 3 thickeners
- 3 film formers
- 3 pH adjusters
- 2 conditioning agents
- 2 preservatives
- 2 solubilizers
- 1 solvent
- 1 fatty alcohol
- 1 conditioning agent
Ingredient list captured 2026-08-23. Formulas change, so check the package in your hand when an ingredient matters to you.
Price · 5.1 oz
Seen at
$30.95
Show the price ladder
Where we’ve seen it3 listings · 3 stores
-
Target
$30.955.1 oz · $6.07/ozAug 30Lowest per ozSale · was $34.00
-
Brand website
$36.005 oz · $7.20/ozAug 23
-
Ulta Beauty
$39.005 oz · $7.80/ozAug 30
Sorted by price per ounce. Dated observations from our research, not live prices. Direct store pages, no affiliate links. We don’t sell this product.
How we work this out
- 5.1 oz is the size stores list most often; every comparison on this page is made at it. Other sizes are shown in the Sizes row and the store list.
- Seen at $30.95 is the price we have observed for the 5.1 oz. We need three stores before we call a price commonly seen.
- About $15 is what heat protectants typically cost at this size. Too few of the products that do the same job carry a price for us to draw a good-value line.
Formula
9
Formula score
9 of 10
This is a complete heat protectant formula. It is also above the range for heat protectants per ounce, with 4 close matches selling for meaningfully less.
How the score is counted
- 4 products that do the same job cost less per ounce
- Costs more per ounce than 84% of the 891 heat protectants we’ve priced
- Covers 5 of the 6 things a heat protectant should do
- Reviewers mention 3 things they like about how it performs
- A film-forming heat spreaderSilicones or polymers that spread heat along the strand.3 pts
- A stated heat claimThe brand names the protection it claims.2 pts
- A light baseWater or a volatile carrier first, so it does not weigh hair down.2 pts
- A humectantBinds water into the hair.1 pt
- Slip for detanglingReduces the force it takes to comb wet hair.1 pt
- Fragrance kept out of the top eightScent as a finishing touch, not a major share.1 pt
The formula score measures completeness for the job: a weighted share of the systems this product type is usually built around that we find in this list. It does not rate how well the product works or its quality, and it never compares across product types.
Does the same job, for less
Formulas that do the same things (cleanse, condition, coat or hold) for less per ounce. Scent, texture and where you buy them can still differ.
Color WowClosest function
Dream Cocktail Kale-Infused Leave-in Treatment
$3.88/oz $3.06/oz less
- Heat protect
- Protein-free
- Alcohol-free
- Function
- Also
Infusium 23Lowest cost per oz
23 PRO Original Vitamin Leave-In Hair Treatment
$0.75/oz $6.19/oz less
- Protein-free
- Alcohol-free
- Medium weight
- Function
- Also
L'Oreal ParisClose function
Elvive Total Repair 5 Ceramide Recharge Leave-In Conditioner
$1.76/oz $5.18/oz less
- Heat protect
- Alcohol-free
- Medium weight
- Function
- Also
See more alternatives in the product library
These products do a similar job. We haven’t matched them to you. Find the one that fits your hair, routine and budget
Final decision
Should you buy it?
Similar results available for lessBest user
People who blow-dry or flat-iron who want heat protection and a protein-free formula
Biggest tradeoff
Not ideal for anyone sensitive to fragrance, curly-method routines, or vegan and cruelty-free shopping
We do not sell products or take placement fees. This page states what the formula and the prices show; the consultation is what matches it to a person.
Claims check
What the brand says, and what the formula shows
Claims are quoted from the brand. We mark a claim supported, partly supported or conflicting only when the ingredient list speaks to it. Everything else stays "stated by the brand". That isn’t a criticism: most claims can’t be checked from a label.
1
SupportedBacked by ingredients
0
Partly supportedSome supporting logic
7
Stated by brandNo clear evidence
0
Potential conflictFormula works against claim
Combats 1 year of visible damage in 1 use
This is a marketing claim; an ingredient list cannot speak to it.
—
Stated by brand
Can’t be confirmed from label.
88% visual reduction of split ends
A brand-run study. We report it as stated and do not repeat the number as fact.
—
Stated by brand
Only the brand’s testing shows this.
Bond repair on the go
No protein or bond ingredient appears in the list.
- Polyquaternium-37
Stated by brand
Can’t be confirmed from label.
2x less breakage
A brand-run study. We report it as stated and do not repeat the number as fact.
—
Stated by brand
Only the brand’s testing shows this.
10x smoother
A brand-run study. We report it as stated and do not repeat the number as fact.
—
Stated by brand
Only the brand’s testing shows this.
pH balancing
A pH adjuster is present, which is how a formula is brought to an acidic pH.
- Citric Acid
- Sodium Hydroxide
Supported
Brought to an acidic pH.
Product did not strip hair color
This is a marketing claim; an ingredient list cannot speak to it.
—
Stated by brand
Can’t be confirmed from label.
How to read this
We look at the first 10–15 ingredients and what they do in a formula, not at the marketing. If the list doesn't speak to a claim, we don't assume.
Reviewers
What people report
Themes that come up again and again in sourced reviews, written by our researchers in their own words. We don’t store or scrape star ratings.
no residue, more glossy/vibrant
did not weigh hair down or leave a residue... more vibrant glossyhydrates bleached microloc'd textured hair
I have 3c hair and LOVE this product!... microlocs... hydrate her bleached endssofter, stronger after one use
Makes hair feel softer and stronger, even after just one useMore from Redken
How this page was made
- Everything above comes from our researched product record: identity, the ingredient list as printed, the brand's own claims, dated prices and review themes our researchers wrote in their own words. No part of this page is written by hand for one product.
- The value band is a fixed label over two stored numbers: this product’s cost per ounce as a percentile of every product of this type we have priced, each at the size it is most often sold in, and how many products we score as doing the same job cost at least a quarter less per ounce.
- Both scores out of ten are defined on this page. The formula score is completeness for the job, computed from a fixed per-format checklist shown beneath the gauge; the price score is cost per ounce against every product of this type we have priced.
- The "Is this right for you?" panel reads only your own consultation answers, and it applies exactly the filters our recommendation engine applies. It is computed when you load the page and is never stored on it.
- 4 sources consulted for this product (3 manufacturer or regulatory, 1 retailer, 0 editorial), last checked 2026-08-25.
- Ingredient references are linked for 12 of 17 product-aware annotations on this page. Fit notes are general formulation guidance. They aren’t a verdict on the finished product or on you.
- We haven’t tested this product in a lab, and we don’t physically test your hair. Formula readings come from the ingredient list. Claims about how it behaves are labelled as the brand's.
- Ingredient order tells you relative amount only above roughly 1%. Prices are what we saw on the dates shown and can change.
- Ingredient names link to our ingredient library, where each entry shows what it does, which product types use it, and where it usually sits on a label across everything we have researched.
- This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.
- Formula readings: derivation v23. Record last updated 2026-10-03.
