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Side by side

Redken Acidic Bonding Concentrate Shampoo vs Redken Extreme Length Shampoo

59% function match · 6 of the 13 functions we compared match Formula overlap 24%. Redken Acidic Bonding Concentrate Shampoo and Redken Extreme Length Shampoo 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.

  • Acidic Bonding Concentrate Shampoo — colour-treated 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
Redken Acidic Bonding Concentrate Shampoo — 10.1 oz container Redken

Acidic Bonding Concentrate Shampoo

  • Shampoo
  • Salon
  • Sulfate-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
$33.07 10.1 oz · $3.46/oz
$30–31 10.1 oz · $3.04/oz
Value / price positioning
Same job for less elsewhere $$$$$ Salon tier · costs more than 80% of the 817 shampoos we’ve priced
Same job for less elsewhere $$$$$ 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 Differs
Moderate Removes oil and product; leaves some conditioning behind. 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 Differs
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
None Nothing here needs a detergent wash to remove. Your hair
Clarifying wash needed
Moderate Your hair
Low Your hair
Expected lather Differs
Moderate An ordinary shampoo lather. 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 Differs
Chelators present Chelators are present — they bind hard-water and pool minerals. 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
  • Colour-treated hairthat fades faster in a sulfate wash
  • Protein-sensitive hairthat stiffens when protein is added
  • Hard waterand swimmers dealing with mineral deposit
  • 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
  • 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
  • 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
Acidic Bonding Concentrate
Extreme Length
Where to buy
Target · Ulta
Target · Salons
Free of
  • sulfate-free
  • protein-free
  • silicone-free
  • protein-free
Vegan
Vegan · label states
—
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

$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

IngredientAcidic Bonding Concentrate ShampooExtreme Length Shampoo
Water
Neutral
#1Leading
#1Leading
Cocamidopropyl Betaine
Cleanses
#4Supporting
#4Supporting
Citric Acid
pH balancer
#5Below the 1% line
#5Below the 1% line
Sodium Hydroxide
pH balancer
#6Below the 1% line
#6Below the 1% line
Fragrance
Fragrance
#17Below the 1% line
#7Below the 1% line
Salicylic Acid
Active
#20Below the 1% line
#12Below the 1% line
Sodium Chloride
Stabilizes
#13Below the 1% line
#3Leading
Propylene Glycol
Moisturizes
#15Below the 1% line
#8Below the 1% line
Limonene
Fragrance
#26Below the 1% line
#14Below the 1% line

What only one of them carries

Acidic Bonding Concentrate Shampoo

Extreme Length Shampoo

Full ingredient list — Acidic Bonding Concentrate Shampoo (29)
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.

VerdictsAcidic Bonding Concentrate ShampooExtreme Length Shampoo
Supported
3
0
Partly supported
0
2
Stated by brand
2
1
Potential conflict
0
0

Acidic Bonding Concentrate Shampoo

  • Protects hair from color-fading, damage & heat exposureSupportedLess fade per wash.
  • Revitalizes dull locks with strength & hydrationSupportedHelps hair feel hydrated.
  • Intense conditioning for stronger and more resilient hairStated by brandCan’t be confirmed from label.
  • Most concentrated all-in-one formula for strength repair for all types of damaged hairStated by brandCan’t be confirmed from label.
  • Vegan & sulfate-free formulaSupportedGentler on colour and coils.

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.

Redken Acidic Bonding Concentrate Shampoo draws complaints about the packaging.

Acidic Bonding Concentrate Shampoo

Users report the shampoo feels salon-quality and recommend it to family/friends

general users

Reviewers describe hair as clean, silky, and smooth after use

general users

Reviewers with fine hair report the 3-step system (shampoo, conditioner, leave-in) makes hair feel thicker and healthier

fine hair

Multiple reviewers praise softness and nourishment without weigh-down concerns raised

general users

A recurring complaint is damaged/leaking packaging during shipping, unrelated to the product formula itself

general users

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 $3.46/oz — within about the same cost per ounce.

$0.00/oz median $1.48/oz $17.29/oz $3.46/oz Acidic Bonding Concentrate $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 readAcidic Bonding Concentrate 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.

Acidic Bonding Concentrate Shampoo vs Instacure Build-A-Bond Mighty Bonds ShampooMatrix · 100% function matchExtreme Length Shampoo vs A Curl Can Dream Weightless Moisture ShampooMatrix · 100% function matchAcidic Bonding Concentrate Shampoo vs Legendary ShampooIGK Hair · 96% function matchExtreme Length Shampoo vs Kerastase Genesis Bain Hydra-Fortifiant ShampooKerastase · 98% function matchAcidic Bonding Concentrate Shampoo vs Bond Rx ShampooPaul Mitchell · 96% function matchExtreme Length Shampoo vs Volume Injection ShampooRedken · 98% function matchAcidic Bonding Concentrate Shampoo vs Straight Hair ShampooFunction of Beauty · 94% function matchExtreme Length Shampoo vs Kerastase Specifique Bain Divalent ShampooKerastase · 98% function match

Acidic Bonding Concentrate 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.
  • 8 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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