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Side by side

Kerastase Kerastase Genesis Bain Hydra-Fortifiant Shampoo vs Redken Extreme Length Shampoo

98% function match · 12 of the 13 functions we compared match Formula overlap 98%. Kerastase Kerastase Genesis Bain Hydra-Fortifiant Shampoo and Redken Extreme Length Shampoo 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.

  • Kerastase Genesis Bain Hydra-Fortifiant Shampoo — protein-sensitive hair
  • Extreme Length Shampoo — protein-sensitive hair

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 Kerastase Genesis Bain Hydra-Fortifiant Shampoo — 8.5 oz container Kerastase

Kerastase Genesis Bain Hydra-Fortifiant Shampoo

  • Shampoo
  • Prestige
  • Silicone-free
  • Protein-free
Redken Extreme Length Shampoo — 10.1 oz container Redken

Extreme Length Shampoo

  • Shampoo
  • Salon
  • Silicone-free
  • Protein-free
Price, size & price per ounce
$38.73 8.5 oz · $4.61/oz
$30–31 10.1 oz · $3.04/oz
Value / price positioning
Same job for less elsewhere $$$$$ Prestige tier · costs more than 93% of the 817 shampoos we’ve priced
Same job for less elsewhere $$$$$ Salon tier · costs more than 76% of the 817 shampoos we’ve priced
Best for hair types
All types Nothing in the formula or the claims narrows this to one pattern. Your hair
All types Nothing in the formula or the claims narrows this to one pattern. Your hair
Moisture level Same
Moderate Humectants in the working part of the formula. Your hair
Moderate Humectants in the working part of the formula. Your hair
Cleansing strength Same
Strong Removes oil, buildup, and most residue — a reset wash. Your hair
Strong Removes oil, buildup, and most residue — a reset wash. Your hair
Slip / detangling Same
Moderate Conditioning agents are present, lower in the list. Your hair
Moderate Conditioning agents are present, lower in the list. Your hair
Weight on hair
Light Water-first and light: unlikely to flatten fine hair. Your hair
Light Water-first and light: unlikely to flatten fine hair. Your hair
Fragrance
Present Fragrance is listed; it sits below the working ingredients. Your hair
Prominent Fragrance sits in the first eight ingredients — a larger share of the formula. Your hair
Protein Same
None No protein or amino acids in the list. Your hair
None No protein or amino acids in the list. Your hair
Silicone / wax buildup Same
None Nothing here needs a detergent wash to remove. Your hair
None Nothing here needs a detergent wash to remove. Your hair
Clarifying wash needed
Low Your hair
Low Your hair
Expected lather Same
High Thick foam that spreads quickly through the hair. Your hair
High Thick foam that spreads quickly through the hair. Your hair
Scalp active Same
None No over-the-counter scalp active. Your hair
None No over-the-counter scalp active. Your hair
Hard-water defence Same
None No chelating agent in the list. Your hair
None No chelating agent in the list. Your hair
Formula completeness
out of 10
Complete for its job
out of 10
Complete for its job
Who should choose this
  • Protein-sensitive hairthat stiffens when protein is added
  • Fast-oiling scalpsthat need a real reset wash
  • Fine hairthat flattens under most products
  • Silicone-free routinesno silicones appear in the list
  • Protein-sensitive hairthat stiffens when protein is added
  • Fast-oiling scalpsthat need a real reset wash
  • Fine hairthat flattens under most products
  • Silicone-free routinesno silicones appear in the list
Why you might skip it
  • Scents bother youthis product carries a scent
  • Sulfate-free routinesit uses a sulfate detergent
  • Dry or damaged haira strong detergent system strips as it cleans
  • Scents bother youthis product carries a scent
  • Sulfate-free routinesit uses a sulfate detergent
  • Dry or damaged haira strong detergent system strips as it cleans
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
Shampoo
Shampoo
Line
Genesis
Extreme Length
Where to buy
Target
Target · Salons
Free of
  • silicone-free
  • protein-free
  • silicone-free
  • protein-free
Cruelty-free
Not cruelty-free · PETA-listed
Not cruelty-free · PETA-listed
Scent
Scented, not described
Scented, not described

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

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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

IngredientKerastase Genesis Bain Hydra-Fortifiant ShampooExtreme Length Shampoo
Water
Neutral
#1Leading
#1Leading
Sodium Laureth Sulfate
Cleanses
#2Leading
#2Leading
Citric Acid
pH balancer
#3Leading
#5Below the 1% line
Cocamidopropyl Betaine
Cleanses
#4Supporting
#4Supporting
Sodium Hydroxide
pH balancer
#5Below the 1% line
#6Below the 1% line
Propylene Glycol
Moisturizes
#6Below the 1% line
#8Below the 1% line
Sodium Chloride
Stabilizes
#7Below the 1% line
#3Leading
Sodium Benzoate
Stabilizes
#8Below the 1% line
#10Below the 1% line
Salicylic Acid
Active
#11Below the 1% line
#12Below the 1% line
Limonene
Fragrance
#12Below the 1% line
#14Below the 1% line
Linalool
Fragrance
#13Below the 1% line
#16Below the 1% line
Fragrance
Fragrance
#27Below the 1% line
#7Below the 1% line

What only one of them carries

Kerastase Genesis Bain Hydra-Fortifiant Shampoo

Extreme Length Shampoo

Full ingredient list — Kerastase Genesis Bain Hydra-Fortifiant Shampoo (27)
Full ingredient list — Extreme Length Shampoo (18)

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.

VerdictsKerastase Genesis Bain Hydra-Fortifiant ShampooExtreme Length Shampoo
Supported
1
0
Partly supported
0
2
Stated by brand
2
1
Potential conflict
0
0

Kerastase Genesis Bain Hydra-Fortifiant Shampoo

  • Gently cleanses and removes scalp buildupSupportedResets a coated scalp.
  • Strengthens weak, fragile hairStated by brandCan’t be confirmed from label.
  • Addresses oily hair by preventing oil build upStated by brandCan’t be confirmed from label.

Extreme Length Shampoo

  • Strengthen distressed hairPartly supportedSupports the surface, not a treatment.
  • Increase strength, shine and softnessStated by brandCan’t be confirmed from label.
  • Helps prevent breakage, promote healthy hair growth, and gently cleansePartly supportedSupports the surface, not a treatment.

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.

Both praised for strength and repair. Kerastase Kerastase Genesis Bain Hydra-Fortifiant Shampoo draws complaints about dryness and the scent.

Kerastase Genesis Bain Hydra-Fortifiant Shampoo

Many reviewers report visible reduction in hair fall/breakage and some new regrowth over months of use, with a lightweight feel that does not weigh down fine hair.

multiple reviewers, fine-hair and hair-loss-concern users

Reviewers frequently praise a pleasant fragrance and added shine after use.

A vocal minority describe severe adverse effects, including large amounts of shedding by the handful and a reported loss of about a third of hair volume over months.

reviewers with sensitive scalps or reactive hair

Some reviewers report scalp irritation, dryness, and itchiness, which they attribute to the strong fragrance/chemical composition.

Extreme Length Shampoo

Strong repurchase intent and enthusiastic recommendation language ("magic in a bottle")

Target reviewers, small sample (3 total reviews across both sizes as of capture date)

Reviewers report visible hair growth and increased thickness after roughly 3 months of consistent use

Long-term users (~3 month usage window) on Target listings

Hair described as feeling notably stronger and healthier, with reduced breakage, after switching to this shampoo

Reviewer specifically contrasting with a prior regular/non-strengthening shampoo

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.

$3.04/oz vs $4.61/oz — Kerastase Kerastase Genesis Bain Hydra-Fortifiant Shampoo costs about 1.5× more per ounce than Redken Extreme Length Shampoo.

$0.00/oz median $1.47/oz $17.29/oz $4.61/oz Kerastase Genesis Bain Hyd $3.04/oz Extreme Length Shampoo

Every mark sits on one distribution because these are compared against the same set: 817 shampoos with a computable unit price.

Value readKerastase Genesis Bain Hydra-Fortifiant ShampooExtreme Length Shampoo
Label
Same job for less elsewhereYou are paying above the range for a formula close to several lower-priced options.
Same job for less elsewhereYou are paying above the range for a formula close to several lower-priced options.

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.

Kerastase Genesis Bain Hydra-Fortifiant Shampoo vs A Curl Can Dream Weightless Moisture ShampooMatrix · 98% function matchExtreme Length Shampoo vs A Curl Can Dream Weightless Moisture ShampooMatrix · 100% function matchKerastase Genesis Bain Hydra-Fortifiant Shampoo vs Volume Injection ShampooRedken · 98% function matchExtreme Length Shampoo vs Volume Injection ShampooRedken · 98% function matchKerastase Genesis Bain Hydra-Fortifiant Shampoo vs Kerastase Specifique Bain Divalent ShampooKerastase · 98% function matchExtreme Length Shampoo vs Kerastase Specifique Bain Divalent ShampooKerastase · 98% function matchKerastase Genesis Bain Hydra-Fortifiant Shampoo vs L'Oreal Paris Elvive Hyaluron Pure Purifying Shampoo for Oily HairL'Oreal Paris Elvive · 96% function matchExtreme Length Shampoo vs L'Oreal Paris Elvive Hyaluron Pure Purifying Shampoo for Oily HairL'Oreal Paris Elvive · 96% function match

Kerastase Genesis Bain Hydra-Fortifiant Shampoo · Extreme Length Shampoo · All shampoos 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.
  • 9 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.

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