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Side by side

Kerastase Kerastase Genesis Bain Hydra-Fortifiant Shampoo vs L'Oreal Paris Elvive Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair

96% function match · 12 of the 13 functions we compared match Formula overlap 89%. Kerastase Kerastase Genesis Bain Hydra-Fortifiant Shampoo and L'Oreal Paris Elvive Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair share 3 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
  • Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair — 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
L'Oreal Paris Elvive Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair — container, alternate view L'Oreal Paris Elvive

Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair

  • Shampoo
  • Drugstore
  • Silicone-free
  • Protein-free
Price, size & price per ounce
$38.73 8.5 oz · $4.61/oz
$11.94 13.5 oz · $0.88/oz
Value / price positioning
Same job for less elsewhere $$$$$ Prestige tier · costs more than 93% of the 817 shampoos we’ve priced
Priced with its peers $$$$$ Drugstore tier · costs less than 72% 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
Collagen Peptide + Lifter
Where to buy
Target
Grocery / mass · Brand website
Free of
  • silicone-free
  • protein-free
  • silicone-free
  • protein-free
Vegan
—
Vegan · label states
Cruelty-free
Not cruelty-free · PETA-listed
—
Scent
Scented, not described
Fresh & airy

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

IngredientKerastase Genesis Bain Hydra-Fortifiant ShampooElvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair
Water
Neutral
#1Leading
#1Leading
Sodium Laureth Sulfate
Cleanses
#2Leading
#2Leading
Citric Acid
pH balancer
#3Leading
#6Below the 1% line
Cocamidopropyl Betaine
Cleanses
#4Supporting
#3Leading
Sodium Hydroxide
pH balancer
#5Below the 1% line
#10Below the 1% line
Sodium Chloride
Stabilizes
#7Below the 1% line
#5Below the 1% line
Sodium Benzoate
Stabilizes
#8Below the 1% line
#9Below the 1% line
Linalool
Fragrance
#13Below the 1% line
#18Below the 1% line
Fragrance
Fragrance
#27Below the 1% line
#4Below the 1% line

What only one of them carries

Kerastase Genesis Bain Hydra-Fortifiant Shampoo

Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair

Full ingredient list — Kerastase Genesis Bain Hydra-Fortifiant Shampoo (27)
Full ingredient list — Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair (25)

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 ShampooElvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair
Supported
1
0
Partly supported
0
0
Stated by brand
2
2
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.

Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair

  • 2x volume lift with 72-hour no weigh-downStated by brandOnly the brand’s testing shows this.
  • 100% Vegan and Paraben-FreeStated by brandOnly the brand’s testing shows this.

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 the scent. Kerastase Kerastase Genesis Bain Hydra-Fortifiant Shampoo draws complaints about dryness and the scent; L'Oreal Paris Elvive Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair draws complaints about weight.

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.

Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair

Reviewers report a clean scent, rich lather, and lightweight feel

Many reviewers report noticeable added volume at the roots

Reviewers with curly hair reported the formula felt heavy for their texture

curly hair

A small number of reviewers reported a scalp burning sensation

Some reviewers did not perceive a significant volumizing effect

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.

$0.88/oz vs $4.61/oz — Kerastase Kerastase Genesis Bain Hydra-Fortifiant Shampoo costs about 5.2× more per ounce than L'Oreal Paris Elvive Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair.

$0.00/oz median $1.48/oz $17.29/oz $4.61/oz Kerastase Genesis Bain Hyd $0.88/oz Elvive Collagen Peptide +

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 ShampooElvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair
Label
Same job for less elsewhereYou are paying above the range for a formula close to several lower-priced options.
Priced with its peersSits in the middle of the range for shampoos per ounce.

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 Extreme Length ShampooRedken · 98% function matchElvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair vs Anti-Dandruff + Dry Scalp ShampooAmerican Crew · 99% function matchKerastase Genesis Bain Hydra-Fortifiant Shampoo vs A Curl Can Dream Weightless Moisture ShampooMatrix · 98% function matchElvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair vs Volume Injection ShampooRedken · 98% function matchKerastase Genesis Bain Hydra-Fortifiant Shampoo vs Volume Injection ShampooRedken · 98% function matchElvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair vs Kerastase Specifique Bain Divalent ShampooKerastase · 98% function matchKerastase Genesis Bain Hydra-Fortifiant Shampoo vs Kerastase Specifique Bain Divalent ShampooKerastase · 98% function matchElvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair vs L'Oreal Paris Elvive Hyaluron Pure Purifying Shampoo for Oily HairL'Oreal Paris Elvive · 96% function match

Kerastase Genesis Bain Hydra-Fortifiant Shampoo · Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair · 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.
  • 7 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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