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Kerastase

Premiere Filler Fondamental Repairing Anti-Frizz Serum

Heat protectant / Serum, medium-weight

Heat protectant
serum
Sulfate-free
Cruelty-free · label states

Size3.04 fl oz

Price$46seen at one store · 3.04 oz

Where to buy1 store

Scent:

The ingredient list declares fragrance. What it smells of is not stated, and we do not guess.

Manufacturer page: valley-beauty.com

Personal fit

Is this right for you?

Factor Your profile Fit

Best for hair types Straight–Curly Not in your profile

Moisture level None found Not in your profile

Oils and butters None Not in your profile

Slip / detangling Moderate Not in your profile

Weight on hair Medium Not in your profile

Fragrance Prominent Not in your profile

Protein Minor 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 Moderate Not in your profile

Vegan / cruelty-free Cruelty-free · label states 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 28 ingredientsAbout average Not in your profile

Price tier Prestige Not in your profile

Where to buy it Salons · Brand website Not in your profile

The consultation builds your hair profile, then reads every factor in this table against it — and tells you where this product fits, or what to use instead.

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$49.00 once, for your consultation and hair profile. No subscription, no required purchases.

Not enough priced heat protectants to place it

We have not priced enough heat protectants to place this one.

Price and stores

Great for

A wide range of haira middle-of-the-range weight

Maybe skip if

this product carries a scent

Curly-method routinesthese silicones need a detergent to remove

Very dry or damaged hairit contains fast-drying alcohol

Tight budgetsit sits in the upper price tiers

How much heat protection you need depends on how often and how hot you style — that is what the consultation works out.

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.

Weight on the hair Medium

Middle of the range — noticeable on fine hair, light on coarse hair.

Slip and detangling Moderate

Conditioning agents are present, lower in the list.

Needs detergent to remove Yes

Water-insoluble silicones or waxes: a detergent wash is what removes them.

Water-binding (humectants) None found

No humectants found — nothing here pulls water into the hair.

Fast-drying alcohol Present

Fast-drying alcohol is present — it speeds drying and can read dry on the hair.

Fragrance Prominent

Fragrance sits in the first eight ingredients — 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. These 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	solvent	The base everything else is dissolved in	Neutral
Isopropyl Myristate	light ester	Light slip without much weight	Softens
Dimethicone	silicone	Spreads heat across the strand	Buildup
Triethanolamine	pH adjuster	Fine-tunes the pH	pH balancer
Amodimethicone	silicone	A little heat-spreading smoothing	Buildup
FragranceParfum	fragrance	The scent	Fragrance
Phenoxyethanol	preservative	Keeps the product from spoiling	Stabilizes
Carbomer	thickener	Adjusts the texture	Holds
Limonene	fragrance	The scent	Fragrance
Hydrolyzed Vegetable Protein PG-Propyl Silanetriol	film former	A supporting film former	Protein
Isopropyl Alcohol	drying alcohol	A small amount, for fast drying	Drying
Linalool	fragrance	The scent	Fragrance

What the list leaves out, and what it carriesNo sulfates. Contains fragrance. The silicones here need a detergent wash to come off. Fast-drying alcohol is in the list.

Full ingredient list (28)

US labelling rules put ingredients above 1% in descending order of amount; below 1% they may be listed in any order. Annotations keep three readings separate: the ingredient's general function, its role in this product type, and what its position can support.

1 Water · Aqua

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 ingredient
Listed in the first three ingredients, it is likely a structural part of this formula.
- solvent
2 Isopropyl Myristate

General function
A very light ester that makes products glide and disappear quickly on the hair.

Leading ingredient
Listed in the first three ingredients, it is likely a structural part of this formula.

May suitFine or easily flattened hair
A light emollient: it softens the surface with noticeably less weight than an oil or a butter.

May suitFrizz-prone, damaged, or high-friction hair
Spreads thin and lowers friction between strands without the heaviness of a fixed oil.

PubChem
- light ester
- emollient
3 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 ingredient
Listed in the first three ingredients, it is likely a structural part of this formula.

May suitClimate-sensitive or frizz-prone hair
A 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 hair
Lays a smooth film along the cuticle, which lowers combing friction and flattens the surface irregularities that read as frizz.

May not suitBuild-up-sensitive routines
Dimethicone 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
▾Below about this point, order stops being meaningful — these are typically used at 1% or less.
4 Triethanolamine

General function
A base used in trace amounts to neutralise acidic polymers so a gel thickens.

Estimated lower-concentration zone
It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

DependsFrizz-prone, damaged, or high-friction hair
pH 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.

PubChem
- pH adjuster
5 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.

Estimated lower-concentration zone
It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

May suitClimate-sensitive or frizz-prone hair
A 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 hair
Amino-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 styling
Film formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.

International Journal of Trichology
- silicone
- conditioning agent
- film former
6 Fragrance · Parfum

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 zone
It 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 routines
Declared fragrance. On a fragrance-sensitive routine this is the line that decides it, wherever it sits on the label.
- fragrance
- declared fragrance
7 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 zone
It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChem
- preservative
8 Carbomer

General function
A thickener that turns a liquid into a clear gel. It also contributes a light hold.

Estimated lower-concentration zone
It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

May suitClimate-sensitive or frizz-prone hair
A set polymer film is a physical barrier to humidity, so a style keeps its shape longer in damp conditions.

May suitMaximum-hold styling
Synthetic film formers dry into a continuous film, which is what holds a shape against movement and against humid air.

DependsBuild-up-sensitive routines
Some acrylate copolymers rinse with water and some need a detergent; the label alone does not say which one a formula used.
- thickener
- polymer
- film former
9 Polyquaternium-4

General function
A cellulose-based hold polymer used in gels and sprays for flexible set.

Estimated lower-concentration zone
It 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 hold
Cationic 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 hair
A cationic polymer stays on the hair through rinsing, which is what keeps static and combing friction down after the wash.

May suitMaximum-hold styling
Film 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
10 Potato Starch Modified

General function
A modified starch. It soaks up oil and water and leaves a dry, slightly grippy feel, which is what puts starches in dry shampoos and texture products.

Estimated lower-concentration zone
It 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 hair
Adds grip and body with no oil attached, which is what lifts fine hair at the root instead of weighing it down.

DependsMaximum-hold styling
Starch gives texture and grip rather than a set film; firm hold usually needs a polymer alongside it.
- starch
- absorbent
11 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 zone
It 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 routines
One 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.

PubChem
- fragrance
- named fragrance allergen
12 Hydroxypropyl Guar

General function
A modified guar gum used to thicken and give a slippery, cushioned feel.

Estimated lower-concentration zone
It 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 hold
Gums thicken and set soft, which gives definition that bends rather than a rigid cast.

May suitMaximum-hold styling
A styling polymer dries into a film across the strands, which is what makes a shape hold instead of relax.
- gum
- thickener
- polymer
13 Behentrimonium Chloride

General function
A positively charged conditioning agent that binds to damaged, negatively charged spots on the hair. It is the main detangling ingredient in most rinse-out conditioners.

Estimated lower-concentration zone
It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

May suitFrizz-prone, damaged, or high-friction hair
A cationic conditioning agent: it binds to the damaged, negatively charged parts of the cuticle and lowers combing friction there.

DependsBuild-up-sensitive routines
Substantive by design. A routine with no detergent wash gives it nothing to leave with.

DependsVery dry or highly damaged hair
Every detergent removes some sebum along with the product it is there to wash out. Which detergent it is matters more than that there is one.

International Journal of Cosmetic Science
- conditioning agent
- cleanser
14 Hydrolyzed Vegetable Protein PG-Propyl Silanetriol

General function
A plant protein modified to bind more firmly to hair than a plain hydrolysed protein. Used for strength and body claims.

Estimated lower-concentration zone
It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

May suitFrizz-prone, damaged, or high-friction hair
Filling surface gaps evens out the cuticle, which is part of what makes damaged hair comb and reflect light more like undamaged hair.

May suitMaximum-hold styling
Film formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.

May suitVery dry or highly damaged hair
Hydrolysed fragments are small enough to sit in the gaps of a worn cuticle for a wash or two, temporarily restoring stiffness and cutting breakage in combing.
- film former
- protein
- hydrolysed protein
15 Glycine

General function
The smallest amino acid in hair protein, added for moisture binding.

Estimated lower-concentration zone
It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

May suitVery dry or highly damaged hair
Amino acids are the smallest protein fraction and bind water as well, so they add far less stiffness than a hydrolysed protein does.

DependsProtein-sensitive hair
The lightest option in the protein family, but still protein — worth watching if protein reliably stiffens your hair.

PubChem
- amino acid
16 Trideceth-6
- emulsifier
- solubilizer
17 Isopropyl Alcohol

General function
A fast-evaporating alcohol used as a solvent and to speed drying. Well down the list it is a processing aid; near the top it can leave hair feeling dry.

Estimated lower-concentration zone
It 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 hair
Evaporates on contact, which is how a spray sets almost instantly and leaves no weight behind it.

PubChem
- drying alcohol
- solvent
18 Linalool

General function
A floral fragrance component listed separately as a recognised contact allergen.

Estimated lower-concentration zone
It 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 routines
One 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.

PubChem
- fragrance
- named fragrance allergen
19 Cetrimonium Chloride

General function
A quick-acting conditioning agent that reduces static and combing force. It also helps keep the formula stable.

Estimated lower-concentration zone
It 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 hair
The C16 quat binds mostly by charge rather than by chain, so it deposits measurably less than the C22 ones. Less deposit is less conditioning and also less weight, which is usually the trade fine hair wants.

May suitFrizz-prone, damaged, or high-friction hair
A cationic conditioning agent: it binds to the damaged, negatively charged parts of the cuticle and lowers combing friction there.

DependsBuild-up-sensitive routines
Substantive by design. A routine with no detergent wash gives it nothing to leave with.

International Journal of Cosmetic Science
- conditioning agent
- cleanser
20 Citral

General function
A lemon-scented fragrance component listed separately as a recognised allergen.

Estimated lower-concentration zone
It 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 routines
One 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.

PubChem
- fragrance
- named fragrance allergen
21 Coumarin

General function
A sweet, hay-like fragrance component listed separately as a recognised allergen.

Estimated lower-concentration zone
It 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 routines
One 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.

PubChem
- fragrance
- named fragrance allergen
22 Benzyl Salicylate

General function
A soft floral fragrance component listed separately as a recognised allergen.

Estimated lower-concentration zone
It 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 routines
One 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.

PubChem
- fragrance
- named fragrance allergen
23 Sodium Benzoate
- preservative
24 Benzyl Alcohol
- preservative
- solvent
25 Citronellol

General function
A rose-like fragrance component named separately as a recognised allergen.

Estimated lower-concentration zone
It 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 routines
One 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.

PubChem
- fragrance
- named fragrance allergen
26 Alpha-Isomethyl Ionone

General function
A violet-like fragrance component named separately as a recognised allergen.

Estimated lower-concentration zone
It 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 routines
One 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.

PubChem
- fragrance
- named fragrance allergen
27 Potassium Sorbate
- preservative
28 Geraniol

General function
A rose-scented fragrance component, listed on its own because some people react to it.

Estimated lower-concentration zone
It 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 routines
One 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

9 fragrances
8 named fragrance allergens
4 film formers
4 preservatives
3 solvents
3 polymers
3 conditioning agents
2 emollients
2 silicones
2 conditioning agents
2 thickeners
2 cleansers
1 light ester
1 pH adjuster

Ingredient list captured 2026-09-15. Formulas change — check the package in your hand when an ingredient matters to you.

Price · 3.04 oz

Seen at $46 1 store · checked Sep 15

Good value under $29 Under $9.57/oz it costs less than three-quarters of the 8 products we score as doing the same job

Priced above the products that do the same job. Stores sell it above the $29 line; products that do this job typically go for about $30 at this size.

Show the price ladder

Price for 3.04 ozlower is better

Where we’ve seen it1 listing · 1 store

Valley Beauty (valley-beauty.com)
$46.00

3.04 oz · $15.13/oz

Sep 15Lowest per oz

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

3.04 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 $46 is the price we have observed for the 3.04 oz. We need three stores before we call a price commonly seen.
Good value under $29 comes from the 8 products we score as doing the same job as this one. A quarter of them cost less than $9.57/oz; at 3.04 oz that is $29. Under that line you are paying less than most of them.
About $30 is what those same products typically cost at this size — the midpoint of their prices per ounce, scaled to 3.04 oz.

Formula

Formula score

6 of 10

We do not have enough heat protectants with a computable price per ounce to say where this one sits in the range.

How the score is counted

No stated heat claim in the formula
Prestige tier, sold at Salons and Brand website
Prestige tier
1 sources consulted for this record

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 is completeness for the job: the share of the systems this product type is normally built around that we can find in this list, weighted. It is not efficacy, not quality, and it never compares across product types.

Does the same job

Same derived functions — what it cleans, conditions, coats or holds — at a lower cost per ounce. Scent, texture and where you buy it can still differ.

KerastaseClosest function Résistance Extentioniste Thermique $10.20/oz

Protein-free
Medium weight

Function: Slip and detangling
Water-binding (humectants)
Protein
Also: 5.1 oz bottle

Compare

KerastaseClose function Resistance Heat Protecting Leave-In Treatment for Split Ends $9.80/oz

Heat protect
Protein-free
Medium weight

Function: Slip and detangling
Water-binding (humectants)
Protein
Also: 5.1 oz bottle
Sold at specialty beauty counters

Compare

KerastaseLowest cost per oz Nutritive Nectar Thermique Beautifying Anti-frizz Blow Dry Milk $8.87/oz

Lightweight

· Close function

Function: Water-binding (humectants)
Weight on the hair
Also: 5.1 oz bottle

Compare

See more alternatives in the product library

These are functional neighbours, not personal recommendations — they are close on formula, not chosen for anyone. Get the one that fits your hair, routine, and budget

Final decision

Should you buy it?

Depends on your hair — see who it suits

Best user

Most hair types, looking for something that is neither heavy nor thin

Biggest tradeoff

Not ideal for anyone sensitive to fragrance, curly-method routines, or very dry or high-damage hair

Best alternative if not

Nothing in our library matches it closely at a lower price.

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, against what the formula shows

Claims are quoted from the brand. We only mark one supported, partly supported, or conflicting when the ingredient list actually speaks to it; everything else stays "stated by the brand", which is not a criticism — most claims simply cannot be read off a label.

SupportedBacked by ingredients

Partly supportedSome supporting logic

Stated by brandNo clear evidence

Potential conflictFormula works against claim

Protects hair from heat damage up to 450°F

Heat protection is a performance claim; an ingredient list cannot confirm it.

Dimethicone
Amodimethicone
Carbomer

Stated by brand

Only lab testing can show this.

Reduces appearance of split ends

Protein or ceramides are present, but low enough that this reads as support, not treatment.

Polyquaternium-4
Behentrimonium Chloride
Hydrolyzed Vegetable Protein PG-Propyl Silanetriol

Partly supported

Supports the surface, not a treatment.

99% stronger hair; 85% shinier hair

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.

Smooths frizz for up to 72 hours

Silicones or film formers smooth the cuticle, which is the usual mechanism.

Dimethicone
Amodimethicone
Carbomer

Supported

Smoother strands, less frizz.

Up to 3x smoother and 2x softer hair

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.

How to read this

We look at the first 10–15 ingredients and what they do in a formula — not marketing. If the list doesn't speak to a claim, we don't assume.

How this page was made

Everything above is generated from our researched product record — identity, the ingredient list as printed, the brand's own claims, dated price observations, and review themes written in our researchers' own words. No part of this page is written per 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.
1 source consulted for this product (0 manufacturer or regulatory, 1 retailer, 0 editorial), last checked 2026-09-15.
Ingredient references are linked for 14 of 22 product-aware annotations on this page. Fit notes are conditional formulation guidance, not a conclusion about the finished product or about you.
We have not tested this product in a lab and we do not physically test your hair. Formula readings come from the ingredient list; behaviour claims are labelled as the brand's.
Ingredient order tells you relative amount only above roughly 1%. Prices are observations on the dates shown and change without notice.
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 v22. Record last updated 2026-09-16.

Premiere Filler Fondamental Repairing Anti-Frizz Serum

Is this right for you?

Read from the label, not the marketing

The ingredients that change a decision

What the whole list adds up to

Should you buy it?

What the brand says, against what the formula shows

More from Kerastase

How this page was made

Your personalized hair plan