Skip to main content

Side by side

Redken Acidic Grow Full System Densifying Shampoo vs Redken Color Extend Magnetics Shampoo

50% function match · 5 of the 13 functions we compared match Formula overlap 0%. Redken Acidic Grow Full System Densifying Shampoo and Redken Color Extend Magnetics Shampoo share no ingredient among each other's most prominent — which does not stop them doing the same job.

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 Grow Full System Densifying Shampoo — protein-sensitive hair
  • Color Extend Magnetics Shampoo — colour-treated 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 Grow Full System Densifying Shampoo — 10.1 oz container Redken

Acidic Grow Full System Densifying Shampoo

  • Shampoo
  • Salon
  • Silicone-free
  • Protein-free
Redken Color Extend Magnetics Shampoo — 10.1 oz container Redken

Color Extend Magnetics Shampoo

  • Shampoo
  • Salon
  • Sulfate-free
  • Lightweight
Price, size & price per ounce
$37 10.14 oz · $3.65/oz
$27–30 10.1 oz · $2.77/oz
Value / price positioning
Same job for less elsewhere $$$$$ Salon tier · costs more than 83% of the 817 shampoos we’ve priced
Upper-mid price for a shampoo $$$$$ Salon tier · costs more 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 Differs
High Humectants near the top — water-binding is a headline mechanism here. Your hair
Low Humectants appear, but low enough to be a minor part. 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
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
None No protein or amino acids in the list. Your hair
Minor Protein appears, low enough to be a supporting ingredient. Your hair
Silicone / wax buildup Differs
None Nothing here needs a detergent wash to remove. Your hair
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
Clarifying wash needed
Low Your hair
Moderate Your hair
Expected lather Differs
High Thick foam that spreads quickly through the hair. Your hair
Moderate An ordinary shampoo lather. 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
None No chelating agent in the list. Your hair
Chelators present Chelators are present — they bind hard-water and pool minerals. 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
  • Colour-treated hairthat fades faster in a sulfate wash
  • Fast-oiling scalpsthat need a real reset wash
  • Hard waterand swimmers dealing with mineral deposit
  • Fine hairthat flattens under most products
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
  • Curly-method routinesthese silicones need a detergent to remove
  • 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
—
Color Extend Magnetics
Where to buy
Salons · Ulta
Target · Ulta
Free of
  • silicone-free
  • protein-free
  • sulfate-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

$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 Grow Full System Densifying ShampooColor Extend Magnetics Shampoo
Water
Neutral
#1Leading
#1Leading
Sodium Chloride
Stabilizes
#4Supporting
#8Supporting
Propylene Glycol
Moisturizes
#5Supporting
#16Below the 1% line
Fragrance
Fragrance
#6Below the 1% line
#11Below the 1% line
Citric Acid
pH balancer
#7Below the 1% line
#15Below the 1% line
Linalool
Fragrance
#21Below the 1% line
#28Below the 1% line

What only one of them carries

Acidic Grow Full System Densifying Shampoo

Color Extend Magnetics Shampoo

Full ingredient list — Acidic Grow Full System Densifying Shampoo (29)
Full ingredient list — Color Extend Magnetics Shampoo (52)

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 Grow Full System Densifying ShampooColor Extend Magnetics Shampoo
Supported
0
1
Partly supported
0
2
Stated by brand
2
0
Potential conflict
0
0

Acidic Grow Full System Densifying Shampoo

  • Densifying Complex for thin, flat hairStated by brandCheck the position, not the name.
  • Gently cleanses while delivering scalp rebalancing benefitsStated by brandCan’t be confirmed from label.

Color Extend Magnetics Shampoo

  • Sulfate-free formula gently restores nutrition to hair tipsSupportedGentler on colour and coils.
  • Protein complex thoroughly cleanses and fortifies the root, core, and tipPartly supportedSupports the surface, not a treatment.
  • Nourishes and strengthens hair without stripping hair colorPartly supportedSome hydration, at a low level.

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 Grow Full System Densifying Shampoo draws complaints about dryness and the scent.

Acidic Grow Full System Densifying Shampoo

Reviewers with fine or thin hair report it cleanses and adds fullness/density without feeling heavy

fine/thin hair

Praised for scalp care/deep cleansing without stripping the scalp

Lightweight, clear formula that lathers well and rinses cleanly

A minority of reviewers found it drying on the hair despite liking the scent

Color Extend Magnetics Shampoo

Long-time Redken users describe the shampoo and its paired conditioner as improving softness and manageability for color-treated hair

long-time Redken users

Praised for maintaining and protecting hair color vibrancy on color-treated hair

general color-treated hair users

Reviewers who buy the shampoo often purchase the matching Color Extend Magnetics conditioner as a set, reporting both work well together

repeat/paired-purchase reviewers

Reviewers with gray or highlighted hair note the shampoo accentuates their silver/highlight tones

gray/highlighted-hair 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.

$2.77/oz vs $3.65/oz — Redken Acidic Grow Full System Densifying Shampoo costs about 1.3× more per ounce than Redken Color Extend Magnetics Shampoo.

$0.00/oz median $1.47/oz $17.29/oz $3.65/oz Acidic Grow Full System De $2.77/oz Color Extend Magnetics Sha

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

Value readAcidic Grow Full System Densifying ShampooColor Extend Magnetics Shampoo
Label
Same job for less elsewhereYou are paying above the range for a formula close to several lower-priced options.
Upper-mid price for a shampooSits 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.

Acidic Grow Full System Densifying Shampoo vs Kerastase Gloss Absolu Bain Hydra-Glaze ShampooKerastase · 100% function matchColor Extend Magnetics Shampoo vs Miracle Daily Shampoo Plus KeratinIt's a 10 · 100% function matchAcidic Grow Full System Densifying Shampoo vs Kerastase Blond Absolu Bain Lumiere ShampooKerastase · 100% function matchColor Extend Magnetics Shampoo vs GEMSTONE Color ShampooR+Co · 96% function matchAcidic Grow Full System Densifying Shampoo vs 2-in-1 Baby Shampoo & Body WashAttitude · 100% function matchColor Extend Magnetics Shampoo vs SUPER GARDEN ShampooR+Co · 96% function matchAcidic Grow Full System Densifying Shampoo vs 2-in-1 Shampoo and Body Wash Scalp Care : Super leaves (Black Willow & Aspen)Attitude · 100% function matchColor Extend Magnetics Shampoo vs DALLAS Biotin Thickening ShampooR+Co · 96% function match

Acidic Grow Full System Densifying Shampoo · Color Extend Magnetics 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.

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