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Side by side

Kevin Murphy YOUNG.AGAIN.WASH vs Rahua Classic Shampoo

96% function match · 12 of the 13 functions we compared match Formula overlap 37%. Kevin Murphy YOUNG.AGAIN.WASH and Rahua Classic Shampoo 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
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When each one is the right call

What each formula is built for, from its own ingredient list.

  • YOUNG.AGAIN.WASH — colour-treated hair
  • Classic Shampoo — fragrance-free

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
Kevin Murphy YOUNG.AGAIN.WASH — 8.45 oz container Kevin Murphy

YOUNG.AGAIN.WASH

  • Shampoo
  • Prestige
  • Sulfate-free
  • Silicone-free
Rahua Classic Shampoo — 9.3 oz container Rahua

Classic Shampoo

  • Shampoo
  • Prestige
  • Sulfate-free
  • Silicone-free
Price, size & price per ounce
$45 8.45 oz · $5.33/oz
$38 9.3 oz · $4.09/oz
Value / price positioning
Same job for less elsewhere $$$$$ Prestige tier · costs more than 95% of the 817 shampoos we’ve priced
Same job for less elsewhere $$$$$ Prestige tier · costs more than 87% 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
High Humectants near the top — water-binding is a headline mechanism here. Your hair
High Humectants near the top — water-binding is a headline mechanism here. 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
Little Nothing here is built to reduce combing force. Your hair
Little Nothing here is built to reduce combing force. Your hair
Weight on hair
Medium Middle of the range — noticeable on fine hair, light on coarse 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
None listed No fragrance is listed. Your hair
Protein Same
Minor Protein appears, low enough to be a supporting ingredient. Your hair
Minor Protein appears, low enough to be a supporting ingredient. 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
Covers the core
out of 10
Complete for its job
Who should choose this
  • Colour-treated hairthat fades faster in a sulfate wash
  • Fast-oiling scalpsthat need a real reset wash
  • Dry, thirsty hairhumectants and emollients both sit up front
  • Curly-method routinesno sulfates and no water-insoluble silicones
  • Fragrance-freeno fragrance (parfum) on the label — scented
  • Colour-treated hairthat fades faster in a sulfate wash
  • Fast-oiling scalpsthat need a real reset wash
  • Dry, thirsty hairhumectants and emollients both sit up front
Why you might skip it
  • Scents bother youthis product carries a scent
  • Very dry or damaged hairit contains fast-drying alcohol
  • Dry or damaged haira strong detergent system strips as it cleans
  • Scents bother youthis product carries a scent
  • Dry or damaged haira strong detergent system strips as it cleans
  • Dry or very humid airwhere heavy humectants work against you
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
Young.Again
Classic
Where to buy
Brand website · Specialty beauty
Brand website
Free of
  • sulfate-free
  • silicone-free
  • curly-method compatible
  • sulfate-free
  • silicone-free
  • fragrance-free
  • curly-method compatible
Vegan
Not vegan · ingredient list
—
Cruelty-free
Cruelty-free · PETA-listed
—
Scent
Scented, not described
Woody & earthy

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

IngredientYOUNG.AGAIN.WASHClassic Shampoo
Water
Neutral
#1Leading
#1Leading
Sodium C14-16 Olefin Sulfonate
Cleanses
#2Leading
#2Leading
Panthenol
Detangles
#5Supporting
#16Below the 1% line
Glycerin
Moisturizes
#30Below the 1% line
#5Supporting

What only one of them carries

YOUNG.AGAIN.WASH

Classic Shampoo

Full ingredient list — YOUNG.AGAIN.WASH (36)
Full ingredient list — Classic 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.

VerdictsYOUNG.AGAIN.WASHClassic Shampoo
Supported
1
2
Partly supported
1
0
Stated by brand
0
0
Potential conflict
0
0

YOUNG.AGAIN.WASH

  • Put youthful body and bounce back into brittle, damaged hairPartly supportedNeutral on lift.
  • Renewed, youthful-looking lustre, hair that looks and feels young againSupportedReflects light for visible shine.

Classic Shampoo

  • A nourishing shampoo that gently cleanses while strengthening hair from root to tip.SupportedHelps hair feel hydrated.
  • Hair feels refreshed, stronger, and naturally radiant with every washSupportedReflects light for visible shine.

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.

Rahua Classic Shampoo draws complaints about weight and how it cleanses.

YOUNG.AGAIN.WASH

Noticeable improvement in overall hair condition since starting the line

repeat/favorite among Kevin Murphy line

Reduces breakage and improves overall hair health, sometimes alternated with Hydrate Me line

breakage concern, alternates with other KM line

Provides the nutrition mature, dry hair needs

self-described mature dry hair

Classic Shampoo

The Palo Santo scent is repeatedly cited as a highlight, described as spa-like.

Reviewers with fine, oily-scalp hair describe it as an effective clarifying shampoo that controls oil without over-stripping.

fine/oily-scalp reviewers

At least one reviewer reported minimal lather and a greasy, unclean feel on first use.

One reviewer flagged that the ingredient list shown on the Amazon storefront differed from the one on the brand website.

ingredient-list discrepancy across channels

Several reviewers with fine wavy or curly hair find it too heavy or drying when used together with the matching conditioner.

fine wavy/curly 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.

$4.09/oz vs $5.33/oz — Kevin Murphy YOUNG.AGAIN.WASH costs about 1.3× more per ounce than Rahua Classic Shampoo.

$0.00/oz median $1.48/oz $17.29/oz $5.33/oz YOUNG.AGAIN.WASH $4.09/oz Classic Shampoo

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

Value readYOUNG.AGAIN.WASHClassic 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.

YOUNG.AGAIN.WASH vs Aloe Vera ShampooRahua · 96% function matchClassic Shampoo vs Enchanted Island ShampooRahua · 100% function matchYOUNG.AGAIN.WASH vs Enchanted Island ShampooRahua · 96% function matchClassic Shampoo vs Aloe Vera ShampooRahua · 100% function matchYOUNG.AGAIN.WASH vs Babassu Conditioning Sulfate-Free ShampooMielle Organics · 95% function matchClassic Shampoo vs Voluminous ShampooRahua · 96% function matchYOUNG.AGAIN.WASH vs Voluminous ShampooRahua · 93% function matchClassic Shampoo vs Destined For Density Megastrength Caffeine + Biotin + Peptide Density ShampooBriogeo · 96% function match

YOUNG.AGAIN.WASH · Classic 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.
  • 10 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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