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Side by side

Redken Extreme Length Leave-In Conditioner vs Sexy Hair Healthy Seal the Deal Split End Mender Lotion

88% function match · 8 of the 10 functions we compared match Formula overlap 17%. Redken Extreme Length Leave-In Conditioner and Sexy Hair Healthy Seal the Deal Split End Mender Lotion share 4 ingredients among each other's most prominent.

These sit in different steps of a routine — Redken Extreme Length Leave-In Conditioner is a leave-in and Sexy Hair Healthy Seal the Deal Split End Mender Lotion is a heat protectant. Comparing their formulas is fair; treating one as a replacement for the other is not.

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.

  • Extreme Length Leave-In Conditioner — maximum slip
  • Healthy Seal the Deal Split End Mender Lotion — heat styling

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

Extreme Length Leave-In Conditioner

  • Leave-in
  • Salon
  • Sulfate-free
Sexy Hair Healthy Seal the Deal Split End Mender Lotion — 3.4 oz container Sexy Hair

Healthy Seal the Deal Split End Mender Lotion

  • Heat protectant
  • Salon
  • Sulfate-free
  • Moisture-rich
Price, size & price per ounce
$34 5.1 oz · $6.67/oz
about $22 3.4 oz · $6.46/oz
Value / price positioning
Same job for less elsewhere $$$$$ Salon tier · costs more than 81% of the 491 leave-ins we’ve priced
Same job for less elsewhere $$$$$ Salon tier · costs more than 79% of the 564 heat protectants we’ve priced
Best for hair types
All types Nothing in the formula or the claims narrows this to one pattern. Your hair
Straight–Curly Smoothing and thermal products span straight through curly hair. Your hair
Moisture level Differs
Moderate Humectants in the working part of the formula. Your hair
High Humectants near the top — water-binding is a headline mechanism here. Your hair
Oils and butters Same
Low Oils are present, but low enough to be a finishing touch. Your hair
—
Slip / detangling Same
High Conditioning agents sit high in the list — this is a detangling formula. Your hair
High Conditioning agents sit high in the list — this is a detangling formula. Your hair
Weight on hair Same
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 Same
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
Clarifying wash needed
Moderate Your hair
Moderate Your hair
Heat protection
—
High The brand states a protection temperature — a label claim, not a measurement. Your hair
Fast-drying alcohol Same
—
Present Fast-drying alcohol is present — it speeds drying and can read dry on the hair. Your hair
Formula completeness
out of 10
Complete for its job
out of 10
Complete for its job
Who should choose this
  • Maximum slipfor hair that tangles the moment it is wet
  • Curl definitionfilm formers hold a clump together
  • Porous, damaged hairceramides are in the list
  • Cuticle-smoothing pHa pH adjuster brings it to the acidic range hair prefers
  • Heat stylingthe brand states protection to 450°F
  • Maximum slipfor hair that tangles the moment it is wet
  • Dry, thirsty hairhumectants and emollients both sit up front
  • A wide range of haira middle-of-the-range weight
Why you might skip it
  • Scents bother youthis product carries a light 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 strong scent
  • Curly-method routinesthese silicones need a detergent to remove
  • Very dry or damaged hairit contains fast-drying alcohol
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
Leave-in
Heat protectantlotion
Where to buy
—
Brand website · Amazon
Free of
  • sulfate-free
  • sulfate-free
Cruelty-free
Not cruelty-free · PETA-listed
Cruelty-free · PETA-listed
Scent
Scented, not described
Scented, not described
Heat protection
—
up to 450°F

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

IngredientExtreme Length Leave-In ConditionerHealthy Seal the Deal Split End Mender Lotion
Water
Neutral
#1Leading
#1Leading
Cetearyl Alcohol
Softens
#3Leading
#6Supporting
Trideceth-5
Stabilizes
#4Supporting
#19Below the 1% line
Phenoxyethanol
Stabilizes
#6Below the 1% line
#43Below the 1% line
Fragrance
Fragrance
#9Below the 1% line
#12Below the 1% line
Isopropyl Alcohol
Drying
#39Below the 1% line
#18Below the 1% line

What only one of them carries

Extreme Length Leave-In Conditioner

Healthy Seal the Deal Split End Mender Lotion

Full ingredient list — Extreme Length Leave-In Conditioner (40)
Full ingredient list — Healthy Seal the Deal Split End Mender Lotion (57)

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.

VerdictsExtreme Length Leave-In ConditionerHealthy Seal the Deal Split End Mender Lotion
Supported
1
1
Partly supported
1
2
Stated by brand
2
3
Potential conflict
0
0

Extreme Length Leave-In Conditioner

  • Strengthens damaged hair to grow longer and strongerPartly supportedSupports the surface, not a treatment.
  • Reduces breakage by 81% (when using complete system)Stated by brandOnly the brand’s testing shows this.
  • Visibly reduces split end appearance by 78% (when using complete system)Stated by brandOnly the brand’s testing shows this.
  • Adds manageability, smoothness, and shineSupportedEasier detangling, less breakage.

Healthy Seal the Deal Split End Mender Lotion

  • Split End MenderStated by brandCan’t be confirmed from label.
  • Instantly seals & mends your tips to reduce the appearance of split endsPartly supportedSupports the surface, not a treatment.
  • Reduces breakage by +73%Stated by brandOnly the brand’s testing shows this.
  • Strengthens hair, making it more resistant to breakingPartly supportedSupports the surface, not a treatment.
  • Hair looks and feels smooth, strong, and moisturizedSupportedHelps hair feel hydrated.
  • Formulated for most hair types (fine, medium, coarse)Stated by brandCan’t be confirmed from label.

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 frizz control. Redken Extreme Length Leave-In Conditioner draws complaints about dryness and weight.

Extreme Length Leave-In Conditioner

Several reviewers say the product is concentrated and a little goes a long way, making it feel economical despite the premium price.

general Ulta reviewers

Reviewers frequently describe hair as noticeably softer, silkier and less frizzy after use, often mentioning a pleasant lingering scent.

general Ulta reviewers

A recurring complaint is that the product feels sticky, gummy or heavy and leaves hair feeling coated or dirty rather than clean.

general Ulta reviewers

A minority of reviewers report the opposite of the intended effect: dry, rough, or damaged-feeling hair, or increased shedding, after regular use.

general Ulta reviewers

Healthy Seal the Deal Split End Mender Lotion

Silky, smooth finish helps reduce frizz after heat styling

Lori and A, Ulta reviewers

Detangles curls and improves the appearance of split ends

Brianna and Daysh, Ulta/SalonCentric reviewers

Strong fragrance and difficult packaging are complaints

Ulta 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.

$6.46/oz vs $6.67/oz — within about the same cost per ounce.

Extreme Length Leave-In Conditioner

Against 491 leave-ins with a computable unit price.

Healthy Seal the Deal Split End Mender Lotion

Against 564 heat protectants with a computable unit price.

Value readExtreme Length Leave-In ConditionerHealthy Seal the Deal Split End Mender Lotion
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.

Extreme Length Leave-In Conditioner vs No.6 Bond SmootherOlaplex · 93% function matchHealthy Seal the Deal Split End Mender Lotion vs 23 PRO Original Vitamin Leave-In Hair TreatmentInfusium 23 · 93% function matchExtreme Length Leave-In Conditioner vs ProVitamin Leave-In ConditionerAphogee · 90% function matchHealthy Seal the Deal Split End Mender Lotion vs Coily Miracle Leave-InIt's a 10 · 93% function matchExtreme Length Leave-In Conditioner vs Strength Recovery Repairing & Strengthening SprayBiolage · 89% function matchHealthy Seal the Deal Split End Mender Lotion vs Run-Through Detangling PrimerOribe · 90% function matchExtreme Length Leave-In Conditioner vs Genesis Defense Thermique Blow Dry PrimerKerastase · 87% function matchHealthy Seal the Deal Split End Mender Lotion vs Nutricurls Curlixir Defining BalmWella Professionals · 90% function match

Extreme Length Leave-In Conditioner · Healthy Seal the Deal Split End Mender Lotion · All leave-ins 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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