Skip to main content

Side by side

Kerastase Premiere Filler Fondamental Repairing Anti-Frizz Serum vs Kerastase Resistance Heat Protecting Leave-In Treatment for Split Ends

86% function match · 7 of the 10 functions we compared match Formula overlap 99%. Kerastase Premiere Filler Fondamental Repairing Anti-Frizz Serum and Kerastase Resistance Heat Protecting Leave-In Treatment for Split Ends share 4 ingredients among each other's most prominent.

Based on your consultation

Which of these fits your hair?

We check your pattern, moisture need, scalp, fragrance tolerance, weight sensitivity and more against each formula — and say which one lines up.

Your profile at a glance

  • Your answers appear here
  • Your answers appear here
  • Your answers appear here
  • Your answers appear here

When each one is the right call

What each formula is built for, from its own ingredient list.

  • Premiere Filler Fondamental Repairing Anti-Frizz Serum — a wide range of hair
  • Resistance Heat Protecting Leave-In Treatment for Split Ends — heat styling

Side by side

Every trait, aligned

One row per trait, read from each product’s own ingredient list and record. A dash means we have not researched that field for that product — it is not a “no”.

Trait
Kerastase

Premiere Filler Fondamental Repairing Anti-Frizz Serum

  • Heat protectant
  • Prestige
  • Sulfate-free
Kerastase

Resistance Heat Protecting Leave-In Treatment for Split Ends

  • Heat protectant
  • Prestige
  • Sulfate-free
  • Protein-free
Price, size & price per ounce
$46 3.04 oz
$50 5.1 oz · $9.80/oz
Value / price positioning
Not enough priced heat protectants to place it Prestige tier
Priced above most heat protectants $$$$$ Prestige tier · costs more than 94% of the 553 heat protectants we’ve priced
Best for hair types
Straight–Curly Smoothing and thermal products span straight through curly hair. Your hair
Straight–Curly Smoothing and thermal products span straight through curly hair. Your hair
Moisture level Differs
None found No humectants found — nothing here pulls water into the hair. Your hair
Low Humectants appear, but low enough to be a minor part. Your hair
Oils and butters Same
None No oils or butters in the list. Your hair
—
Slip / detangling Differs
Moderate Conditioning agents are present, lower in the list. Your hair
High Conditioning agents sit high in the list — this is a detangling formula. Your hair
Weight on hair Same
Medium Middle of the range — noticeable on fine hair, light on coarse hair. Your hair
Medium Middle of the range — noticeable on fine hair, light on coarse hair. Your hair
Fragrance
Prominent Fragrance sits in the first eight ingredients — a larger share of the formula. Your hair
Present Fragrance is listed; it sits below the working ingredients. Your hair
Protein Differs
Minor Protein appears, low enough to be a supporting ingredient. Your hair
None No protein or amino acids in the list. Your hair
Silicone / wax buildup Same
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
Clarifying wash needed
Moderate Your hair
Moderate Your hair
Heat protection
—
High The brand states a protection temperature — a label claim, not a measurement. Your hair
Fast-drying alcohol Same
Present Fast-drying alcohol is present — it speeds drying and can read dry on the hair. Your hair
Present Fast-drying alcohol is present — it speeds drying and can read dry on the hair. Your hair
Formula completeness
out of 10
Covers the core
out of 10
Complete for its job
Who should choose this
  • A wide range of haira middle-of-the-range weight
  • 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
  • Porous, damaged hairceramides are in the list
Why you might skip it
  • Scents bother youthis product carries a scent
  • Curly-method routinesthese silicones need a detergent to remove
  • Very dry or damaged hairit contains fast-drying alcohol
  • Scents bother youthis product carries a scent
  • Curly-method routinesthese silicones need a detergent to remove
  • Very dry or damaged hairit contains fast-drying alcohol
from the formula stated by the brand reported by reviewers Scale: 1 dot low · 5 dots high, within this product type.
More facts about each one
Type
Heat protectantserum
Heat protectantcream
Where to buy
Salons · Brand website
Sephora
Free of
  • sulfate-free
  • sulfate-free
  • protein-free
Cruelty-free
Cruelty-free · label states
Not cruelty-free · PETA-listed
Scent
Scented, not described
Scented, not described
Heat protection
—
up to 450°F

Facts as we recorded them. A dash means we have not researched that field for that product — it is not a "no".

The bottom line

The bottom line depends on your hair

Which of these two suits you is a question about your hair, not about them. The consultation answers it — and tells you what your routine needs around it.

Take the consultation

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

The detail behind the table

Where the readings above come from: the ingredient lists themselves, each brand’s claims checked against them, what owners report, and cost per ounce in context.

Shared and distinct ingredients

Shared and distinct ingredients

Computed from the ingredient lists as printed. "Shared" means both lists carry it; where it sits on each label is stated, because position is what tells you how much.

What both formulas carry

IngredientPremiere Filler Fondamental Repairing Anti-Frizz SerumResistance Heat Protecting Leave-In Treatment for Split Ends
Water
Neutral
#1Leading
#1Leading
Isopropyl Myristate
Softens
#2Leading
#2Leading
Dimethicone
Buildup
#3Leading
#3Leading
Triethanolamine
pH balancer
#4Below the 1% line
#4Below the 1% line
Amodimethicone
Buildup
#5Below the 1% line
#5Below the 1% line
Fragrance
Fragrance
#6Below the 1% line
#27Below the 1% line
Phenoxyethanol
Stabilizes
#7Below the 1% line
#6Below the 1% line
Carbomer
Holds
#8Below the 1% line
#7Below the 1% line
Limonene
Fragrance
#11Below the 1% line
#21Below the 1% line
Isopropyl Alcohol
Drying
#17Below the 1% line
#15Below the 1% line
Linalool
Fragrance
#18Below the 1% line
#17Below the 1% line
Polyquaternium-4
Detangles
#9Below the 1% line
#8Below the 1% line

What only one of them carries

Premiere Filler Fondamental Repairing Anti-Frizz Serum

Resistance Heat Protecting Leave-In Treatment for Split Ends

Full ingredient list — Premiere Filler Fondamental Repairing Anti-Frizz Serum (28)
Full ingredient list — Resistance Heat Protecting Leave-In Treatment for Split Ends (27)

Claims check

What each brand says, against what each formula shows

Claims are quoted from each brand. We only mark one supported, partly supported, or conflicting when that product’s ingredient list actually speaks to it.

VerdictsPremiere Filler Fondamental Repairing Anti-Frizz SerumResistance Heat Protecting Leave-In Treatment for Split Ends
Supported
1
0
Partly supported
1
4
Stated by brand
3
1
Potential conflict
0
0

Premiere Filler Fondamental Repairing Anti-Frizz Serum

  • Protects hair from heat damage up to 450°FStated by brandOnly lab testing can show this.
  • Reduces appearance of split endsPartly supportedSupports the surface, not a treatment.
  • 99% stronger hair; 85% shinier hairStated by brandOnly the brand’s testing shows this.
  • Smooths frizz for up to 72 hoursSupportedSmoother strands, less frizz.
  • Up to 3x smoother and 2x softer hairStated by brandOnly the brand’s testing shows this.

Resistance Heat Protecting Leave-In Treatment for Split Ends

  • Seals split ends, strengthens, and prevents damagePartly supportedSupports the surface, not a treatment.
  • Prevents breakage and seals split endsPartly supportedSupports the surface, not a treatment.
  • Its creamy formula is designed to reduce breakage, seal split ends, and protect against heatPartly supportedSupports the surface, not a treatment.
  • Protects from heat damage up to 450FPartly supportedSold for hot tools; untestable here.
  • Apply onto mid-lengths and ends for seamless detangling and frizz reductionStated by brandHow to use it, not a claim.

What owners say

What people report

Recurring themes our researchers wrote in their own words from sourced reviews. We do not store or scrape star ratings, and we never balance one product’s themes against another’s by inventing them.

Premiere Filler Fondamental Repairing Anti-Frizz Serum

No review themes researched for this product yet.

Resistance Heat Protecting Leave-In Treatment for Split Ends

Protects from heat and supports smooth, frizz-free blowouts

Kérastase official and Walmart reviewers

Lightweight treatment softens and hydrates dry ends

Kérastase official reviewers

Scent and softness are frequently praised

Kérastase official reviewers

Price check

Cost per ounce, in context

Cost per ounce against every product of this type we have priced, each at the size it is most often sold in. Value labels are computed from that percentile and from how many products that do the same job cost less; they are comparisons, not judgements about a brand.

Resistance Heat Protecting Leave-In Treatment for Split Ends

Against 553 heat protectants with a computable unit price.

Value readPremiere Filler Fondamental Repairing Anti-Frizz SerumResistance Heat Protecting Leave-In Treatment for Split Ends
Label
Not enough priced heat protectants to place itWe need more comparable products before we can place this.
Priced above most heat protectantsCosts more per ounce than most heat protectants; nothing in our library matches it closely for less.

Computed from cost per ounce against every product of this type we have priced, and from how many products that do the same job cost less. It is a comparison, not a judgement about the brand.

Compare with something else

Close formulas to each of these, as their own comparison pages.

Premiere Filler Fondamental Repairing Anti-Frizz Serum vs Résistance Extentioniste ThermiqueKerastase · 86% function matchResistance Heat Protecting Leave-In Treatment for Split Ends vs Résistance Extentioniste ThermiqueKerastase · 100% function matchPremiere Filler Fondamental Repairing Anti-Frizz Serum vs Nutritive Nectar Thermique Beautifying Anti-frizz Blow Dry MilkKerastase · 86% function matchResistance Heat Protecting Leave-In Treatment for Split Ends vs A Curl Can Dream Scrunch N' Go Defining SprayMatrix · 89% function matchPremiere Filler Fondamental Repairing Anti-Frizz Serum vs Nutritive Nectar Thermique Heat Protecting CreamKerastase · 86% function matchResistance Heat Protecting Leave-In Treatment for Split Ends vs Miracle Rescue Instant Repair Leave-On with Melting Pro-V PearlsPantene · 89% function matchPremiere Filler Fondamental Repairing Anti-Frizz Serum vs Resistance Serum Therapiste Serum Strengthening Serum Heat ProtectantKerastase · 77% function matchResistance Heat Protecting Leave-In Treatment for Split Ends vs Instacure Build-A-Bond Super Sealing Leave-In BalmMatrix · 88% function match

Premiere Filler Fondamental Repairing Anti-Frizz Serum · Resistance Heat Protecting Leave-In Treatment for Split Ends · All heat protectants in the library

How this page was made

  • This page is assembled from the same researched records the individual product pages render: identity, each ingredient list as printed, each brand's own claims, dated price observations, and review themes written in our researchers' own words. Nothing on it is written per comparison.
  • We do not rank these against each other. Which of them suits you depends on your hair, and that is what the consultation works out.
  • The formula similarity percentage is a stored, precomputed number: position-weighted overlap of the two ingredient lists blended with agreement on the attributes we derive. It measures how alike two formulas are, not how well either works.
  • 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.
  • 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.
  • 5 sources were consulted across the products on this page.
  • Ingredient order tells you relative amount only above roughly 1%. Prices are observations on the dates shown and change without notice. We do not sell these products and take no placement fees.
  • This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.

Still unsure? Take your consultation or browse more products.

Your personalized hair plan

Tell us what’s going on with your hair, see what we understand, and get a plan built around it — with the reason behind every recommendation.

Free to start · $49.00 for your consultation and hair profile · No subscription · Nothing you must buy

Start your consultation