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Side by side

Kerastase Kerastase Specifique Bain Divalent Shampoo vs L'Oreal Paris Elvive Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair

98% function match · 12 of the 13 functions we compared match Formula overlap 41%. Kerastase Kerastase Specifique Bain Divalent Shampoo and L'Oreal Paris Elvive Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair share 2 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 Specifique Bain Divalent 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 Specifique Bain Divalent Shampoo — 16.9 oz container Kerastase

Kerastase Specifique Bain Divalent 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
$70 16.9 oz · $3.46/oz
$11.94 13.5 oz · $0.88/oz
Value / price positioning
Same job for less elsewhere $$$$$ Prestige tier · costs more than 80% of the 805 shampoos we’ve priced
Priced with its peers $$$$$ Drugstore tier · costs less than 71% of the 805 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
  • Dry, thirsty hairhumectants and emollients both sit up front
  • Fine hairthat flattens under most products
  • 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
—
Collagen Peptide + Lifter
Where to buy
Salons · Amazon · Lookfantastic
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 Specifique Bain Divalent ShampooElvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair
Water
Neutral
#2Leading
#1Leading
Sodium Laureth Sulfate
Cleanses
#3Leading
#2Leading
Hexyl Cinnamal
Fragrance
#20Below the 1% line
#13Below the 1% line
Linalool
Fragrance
#22Below the 1% line
#18Below the 1% line
Fragrance
Fragrance
#30Below the 1% line
#4Below the 1% line
Sodium Chloride
Stabilizes
#9Secondary
#5Below the 1% line
Citric Acid
pH balancer
#28Below the 1% line
#6Below the 1% line
Sodium Benzoate
Stabilizes
#10Below the 1% line
#9Below the 1% line

What only one of them carries

Kerastase Specifique Bain Divalent Shampoo

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

Full ingredient list — Kerastase Specifique Bain Divalent Shampoo (30)
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 Specifique Bain Divalent 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 Specifique Bain Divalent Shampoo

  • A cleansing and balancing shampoo that reduces sebum and hydrates to leave hair clean and glossy.SupportedHelps hair feel hydrated.
  • 97% agree shampoo deeply cleanses hair & scalpStated by brandOnly the brand’s testing shows this.
  • 97% agree shampoo does not weigh hair downStated by brandOnly the brand’s testing shows this.

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 how it cleanses. L'Oreal Paris Elvive Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair draws complaints about weight and irritation.

Kerastase Specifique Bain Divalent Shampoo

Frequently professionally recommended - several reviewers say a hairdresser suggested the product, and describe using it as a periodic reset shampoo alternated with their regular one rather than a daily-only product.

salon-referred customers

Reviewers with color-treated, curly or wavy hair report improved manageability, control and shine alongside the oil control benefit, not just scalp cleansing.

colored / curly hair reviewers

Effective at reducing scalp oiliness/greasiness with regular use without over-stripping hair, though several reviewers note results build gradually rather than instantly.

reviewers with oily scalp / fine or thick hair

Works well specifically for the oily-roots/dry-ends combination pattern (dual-action balancing), a distinct use case from a purely oily-all-over scalp.

oily roots + dry/color-grown-out ends

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 $3.46/oz — Kerastase Kerastase Specifique Bain Divalent Shampoo costs about 3.9× more per ounce than L'Oreal Paris Elvive Elvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair.

$0.00/oz median $1.47/oz $17.29/oz $3.46/oz Kerastase Specifique Bain $0.88/oz Elvive Collagen Peptide +

Every mark sits on one distribution because these are compared against the same set: 805 shampoos with a computable unit price.

Value readKerastase Specifique Bain Divalent 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 Specifique Bain Divalent Shampoo vs Volume Injection ShampooRedken · 100% function matchElvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair vs Anti-Dandruff + Dry Scalp ShampooAmerican Crew · 99% function matchKerastase Specifique Bain Divalent Shampoo vs Extreme Length ShampooRedken · 98% function matchElvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair vs Volume Injection ShampooRedken · 98% function matchKerastase Specifique Bain Divalent Shampoo vs A Curl Can Dream Weightless Moisture ShampooMatrix · 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 matchKerastase Specifique Bain Divalent Shampoo vs Anti-Dandruff + Dry Scalp ShampooAmerican Crew · 98% function matchElvive Collagen Peptide + Lifter Volumizing Shampoo for Thin, Flat Hair vs Kerastase Genesis Bain Hydra-Fortifiant ShampooKerastase · 96% function match

Kerastase Specifique Bain Divalent 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.
  • 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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