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Side by side

Nioxin Age Defense Conditioner vs Nioxin Nioxin System 4 Scalp Therapy Conditioner

55% function match · 5 of the 10 functions we compared match Formula overlap 69%. Nioxin Age Defense Conditioner and Nioxin Nioxin System 4 Scalp Therapy Conditioner 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.

  • Age Defense Conditioner — protein-sensitive hair
  • Nioxin System 4 Scalp Therapy Conditioner — 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
Nioxin Age Defense Conditioner — front of package Nioxin

Age Defense Conditioner

  • Conditioner
  • Salon
  • Sulfate-free
  • Silicone-free
Nioxin System 4 Scalp Therapy Conditioner — front of package Nioxin

Nioxin System 4 Scalp Therapy Conditioner

  • Conditioner
  • Salon
  • Sulfate-free
  • Fragrance-free
Price, size & price per ounce
$23–29 8.12 oz · $3.26/oz
$26–27 10.1 oz · $2.62/oz
Value / price positioning
Same job for less elsewhere $$$$$ Salon tier · costs more than 77% of the 689 conditioners we’ve priced
Upper-mid price for a conditioner $$$$$ Salon tier · costs more than 68% of the 689 conditioners 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
Oils and butters Same
None No oils or butters in the list. Your hair
None No oils or butters in the list. 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
Prominent Fragrance sits in the first eight ingredients — a larger share of the formula. Your hair
None listed No fragrance is listed. 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
Moderate Your hair
High Your hair
Hard-water defence Same
Chelators present Chelators are present — they bind hard-water and pool minerals. 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
  • Maximum slipfor hair that tangles the moment it is wet
  • 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
  • Maximum slipfor hair that tangles the moment it is wet
  • Very dry hairno fast-drying alcohol in the list
  • Cuticle-smoothing pHa pH adjuster brings it to the acidic range hair prefers
Why you might skip it
  • Scents bother youthis product carries a scent
  • Hair that needs proteinthere is none in this list
  • Dry or very humid airwhere heavy humectants work against you
  • Scents bother youthis product carries a strong scent
  • Curly-method routinesthese silicones need a detergent to remove
  • Vegan and cruelty-freeour record does not support both claims here
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
Conditioner
Conditioner
Line
—
System 4
Where to buy
Brand website · Salons · Amazon
Ulta · Amazon
Free of
  • sulfate-free
  • silicone-free
  • protein-free
  • curly-method compatible
  • sulfate-free
  • fragrance-free
Cruelty-free
Not cruelty-free · PETA-listed
Not cruelty-free · PETA-listed
Scent
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

IngredientAge Defense ConditionerNioxin System 4 Scalp Therapy Conditioner
Water
Neutral
#1Leading
#1Leading
Stearyl Alcohol
Softens
#2Leading
#4Supporting
Cetyl Alcohol
Softens
#3Leading
#2Leading
Stearamidopropyl Dimethylamine
Detangles
#5Supporting
#3Leading
Phenoxyethanol
Stabilizes
#8Below the 1% line
#6Below the 1% line
Mentha Piperita (Peppermint) Oil
Fragrance
#15Below the 1% line
#12Below the 1% line
Mentha Arvensis Leaf Oil
Fragrance
#18Below the 1% line
#13Below the 1% line

What only one of them carries

Age Defense Conditioner

Nioxin System 4 Scalp Therapy Conditioner

Full ingredient list — Age Defense Conditioner (18)
Full ingredient list — Nioxin System 4 Scalp Therapy Conditioner (44)

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.

VerdictsAge Defense ConditionerNioxin System 4 Scalp Therapy Conditioner
Supported
1
1
Partly supported
0
0
Stated by brand
0
1
Potential conflict
0
0

Age Defense Conditioner

  • Free of sulfates, parabens, and silicones.SupportedGentler on colour and coils.

Nioxin System 4 Scalp Therapy Conditioner

  • Thickens and strengthens hair against breakage while providing color protectionSupportedLess fade per wash.
  • 8 out of 10 users saw thicker, fuller hair in 30 daysStated by brandNot something a label can show.

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.

Nioxin Nioxin System 4 Scalp Therapy Conditioner draws complaints about weight and the scent.

Age Defense Conditioner

Users with fine or thin hair describe soft, shiny results without their usual conditioner weigh-down.

Five exact Age Defense Conditioner US brand-site reviews; mixed and low-rating pass inspected.

The fragrance is noticeable; users who dislike strong scents may find it too much.

Five exact Age Defense Conditioner US brand-site reviews; mixed and low-rating pass inspected.

One reviewer reports softer, hydrated hair without noticing changes in thinning or gray hair.

Five exact Age Defense Conditioner US brand-site reviews; mixed and low-rating pass inspected. This particular limitation appears in one of the five reviews.

Nioxin System 4 Scalp Therapy Conditioner

Pairing the conditioner/system with the brand's leave-in scalp treatment (night serum) was reported to shorten the time to noticing less shedding, down to a few days.

reviewer combining with Nioxin overnight scalp serum

Reviewers using the System 4 kit for progressed thinning report noticeably less hair fall and fine new regrowth within weeks.

multiple reviewers, several weeks of regular use

A repeated complaint is the strong fragrance of the system, described as a heavy perfume scent that some find off-putting despite good results.

reviewer using the full system regularly

Not universally effective: one reviewer with a documented thyroid condition reported the opposite of the intended effect, with more breakage and scalp dryness on weekly use.

reviewer with a self-reported thyroid condition

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.

$2.62/oz vs $3.26/oz — Nioxin Age Defense Conditioner costs about 1.2× more per ounce than Nioxin Nioxin System 4 Scalp Therapy Conditioner.

$0.09/oz median $1.60/oz $56.25/oz $3.26/oz Age Defense Conditioner $2.62/oz Nioxin System 4 Scalp Ther

Every mark sits on one distribution because these are compared against the same set: 689 conditioners with a computable unit price.

Value readAge Defense ConditionerNioxin System 4 Scalp Therapy Conditioner
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 conditionerSits in the middle of the range for conditioners 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.

Age Defense Conditioner vs Pantene Abundant & Strong ConditionerPantene · 100% function matchNioxin System 4 Scalp Therapy Conditioner vs ORS HAIRepair Banana & Bamboo Nourishing ConditionerORS · 98% function matchAge Defense Conditioner vs Ultimate Color ConditionerWella Professionals · 100% function matchNioxin System 4 Scalp Therapy Conditioner vs Caviar Anti-Aging Infinite Color Hold ConditionerAlterna Haircare · 95% function matchAge Defense Conditioner vs Big Energy - Volumizing ConditionerCurl Keeper · 100% function matchNioxin System 4 Scalp Therapy Conditioner vs Aura Boost Hydrate ConditionerNot Your Mother's · 95% function matchAge Defense Conditioner vs Curl Clouds - Calming ConditionerCurl Keeper · 100% function matchNioxin System 4 Scalp Therapy Conditioner vs Aura Boost Restore ConditionerNot Your Mother's · 95% function match

Age Defense Conditioner · Nioxin System 4 Scalp Therapy Conditioner · All conditioners 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.
  • 12 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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