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Side by side

Kevin Murphy SMOOTH.AGAIN.WASH vs Kevin Murphy YOUNG.AGAIN.WASH

67% function match · 8 of the 13 functions we compared match Formula overlap 39%. Kevin Murphy SMOOTH.AGAIN.WASH and Kevin Murphy YOUNG.AGAIN.WASH share 4 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.

  • SMOOTH.AGAIN.WASH — colour-treated hair
  • YOUNG.AGAIN.WASH — 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
Kevin Murphy SMOOTH.AGAIN.WASH — 8.45 oz container Kevin Murphy

SMOOTH.AGAIN.WASH

  • Shampoo
  • Salon
  • Sulfate-free
  • Moisture-rich
Kevin Murphy YOUNG.AGAIN.WASH — 8.45 oz container Kevin Murphy

YOUNG.AGAIN.WASH

  • Shampoo
  • Prestige
  • Sulfate-free
  • Silicone-free
Price, size & price per ounce
$10.93 8.45 oz · $6.09/oz
$45 8.45 oz · $5.33/oz
Value / price positioning
Same job for less elsewhere $$$$$ Salon tier · costs more than 98% of the 817 shampoos we’ve priced
Same job for less elsewhere $$$$$ Prestige tier · costs more than 95% 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 Differs
Moderate Conditioning agents are present, lower in the list. 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
Medium Middle of the range — noticeable on fine hair, light on coarse hair. Your hair
Fragrance
Present Fragrance is listed; it sits below the working ingredients. Your hair
Present Fragrance is listed; it sits below the working ingredients. 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 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 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 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
Covers the core
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
  • Hard waterand swimmers dealing with mineral deposit
  • 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
Why you might skip it
  • 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
  • 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
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
Smooth Again
Young.Again
Where to buy
Brand website
Brand website · Specialty beauty
Free of
  • sulfate-free
  • sulfate-free
  • silicone-free
  • curly-method compatible
Vegan
Not vegan · ingredient list
Not vegan · ingredient list
Cruelty-free
Cruelty-free · PETA-listed
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

IngredientSMOOTH.AGAIN.WASHYOUNG.AGAIN.WASH
Water
Neutral
#1Leading
#1Leading
Sodium C14-16 Olefin Sulfonate
Cleanses
#3Leading
#2Leading
Glycerin
Moisturizes
#5Supporting
#30Below the 1% line
Glycol Distearate
Softens
#6Supporting
#4Supporting
Tocopherol
Stabilizes
#7Below the 1% line
#6Below the 1% line

What only one of them carries

SMOOTH.AGAIN.WASH

YOUNG.AGAIN.WASH

Full ingredient list — SMOOTH.AGAIN.WASH (44)
Full ingredient list — YOUNG.AGAIN.WASH (36)

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.

VerdictsSMOOTH.AGAIN.WASHYOUNG.AGAIN.WASH
Supported
3
1
Partly supported
0
1
Stated by brand
0
0
Potential conflict
0
0

SMOOTH.AGAIN.WASH

  • Tame unruly tresses, and fight back against frizz with our targeted smoothing shampooSupportedSmoother strands, less frizz.
  • Nourishes and refines thick, coarse and unruly hairSupportedHelps hair feel hydrated.
  • Delivers all-over softness and a stronger, smoother, shinier-looking finishSupportedSmoother strands, less frizz.

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.

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.

SMOOTH.AGAIN.WASH

Tames frizz on thick, coarse, or curly hair, especially in humid climates

curly/humid-climate reviewers (e.g. Texas)

Improves manageability of fine, unruly, or aging hair texture over repeat use

long-term repeat purchasers

Some reviewers find it hard to distinguish results from the brand's Killer Curls wash

reviewers who also use Killer Curls line

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

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.

$5.33/oz vs $6.09/oz — within about the same cost per ounce.

$0.00/oz median $1.47/oz $17.29/oz $6.09/oz SMOOTH.AGAIN.WASH $5.33/oz YOUNG.AGAIN.WASH

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

Value readSMOOTH.AGAIN.WASHYOUNG.AGAIN.WASH
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.

SMOOTH.AGAIN.WASH vs Argan Oil Hydrating ShampooMarc Anthony · 98% function matchYOUNG.AGAIN.WASH vs Classic ShampooRahua · 96% function matchSMOOTH.AGAIN.WASH vs Hydration ShampooPattern Beauty · 94% function matchYOUNG.AGAIN.WASH vs Aloe Vera ShampooRahua · 96% function matchSMOOTH.AGAIN.WASH vs Coconut & Shea Nourishing ShampooMarc Anthony · 94% function matchYOUNG.AGAIN.WASH vs Enchanted Island ShampooRahua · 96% function matchSMOOTH.AGAIN.WASH vs YouthLock Shampoo Formulated With CollagenJoico · 94% function matchYOUNG.AGAIN.WASH vs Babassu Conditioning Sulfate-Free ShampooMielle Organics · 95% function match

SMOOTH.AGAIN.WASH · YOUNG.AGAIN.WASH · 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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