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Side by side

CHI Scalp-ology Scalp Serum vs IGK Hair Density Scalp Treatment

92% function match · 5 of the 6 functions we compared match Formula overlap 15%. CHI Scalp-ology Scalp Serum and IGK Hair Density Scalp Treatment 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
  • Your answers appear here

When each one is the right call

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

  • Scalp-ology Scalp Serum — fragrance-free
  • Hair Density Scalp Treatment — dry, thirsty 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
CHI Scalp-ology Scalp Serum — container, alternate view CHI

Scalp-ology Scalp Serum

  • Scalp treatment
  • Masstige
  • Sulfate-free
  • Silicone-free
IGK Hair Density Scalp Treatment — 2.1 oz container IGK

Hair Density Scalp Treatment

  • Scalp treatment
  • Salon
  • Moisture-rich
Price, size & price per ounce
$12–17 3 oz · $5.10/oz
about $45 2.1 oz · $21.43/oz
Value / price positioning
Priced with its peers $$$$$ Masstige tier · costs less than 63% of the 152 scalp treatments we’ve priced
Same job for less elsewhere $$$$$ Salon tier · costs more than 77% of the 152 scalp treatments 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
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
Light Water-first and light: unlikely to flatten fine hair. Your hair
—
Fragrance
None listed No fragrance is listed. Your hair
Present Fragrance is listed; it sits below the working ingredients. Your hair
Protein
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
Oils and butters Differs
Present, lower down Oils are present, but low enough to be a finishing touch. Your hair
Present, high in the list Oils sit high in the list — a softening, coating formula. Your hair
Hard-water defence
None No chelating agent in the list. Your hair
—
Formula completeness
out of 10
A simple formula
out of 10
A simple formula
Who should choose this
  • Fragrance-freeno fragrance (parfum) on the label — scented
  • Dry, thirsty hairhumectants and emollients both sit up front
  • Fine hairthat flattens under most products
  • Silicone-free routinesno silicones appear in the list
  • Dry, thirsty hairhumectants and emollients both sit up front
Why you might skip it
  • Scents bother youthis product carries a scent
  • Dry or very humid airwhere heavy humectants work against you
  • Scents bother youthis product carries a scent
  • Very dry or damaged hairit contains fast-drying alcohol
  • 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
Scalp treatmentserum
Scalp treatment
Where to buy
Brand website · Grocery / mass
Brand website
Free of
  • sulfate-free
  • silicone-free
  • fragrance-free
  • curly-method compatible
—
Scent
—
Scented, not described
How often
as needed
—

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

IngredientScalp-ology Scalp SerumHair Density Scalp Treatment
Propanediol
Moisturizes
#2Leading
#19Below the 1% line
Glycerin
Moisturizes
#4Supporting
#12Below the 1% line
Propylene Glycol
Moisturizes
#6Supporting
#22Below the 1% line
Water
Neutral
#7Supporting
#1Leading
Biotin
Neutral
#12Secondary
#4Supporting
Limonene
Fragrance
#28Below the 1% line
#26Below the 1% line

What only one of them carries

Scalp-ology Scalp Serum

Hair Density Scalp Treatment

Full ingredient list — Scalp-ology Scalp Serum (28)
Full ingredient list — Hair Density Scalp Treatment (30)

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.

VerdictsScalp-ology Scalp SerumHair Density Scalp Treatment
Supported
1
0
Partly supported
1
0
Stated by brand
1
2
Potential conflict
0
0

Scalp-ology Scalp Serum

  • A clinically proven blend of Salicylic Acid, Undecylenic Acid, and Arginine works to balance and protect the scalpStated by brandOnly the brand’s testing shows this.
  • Nettle detoxifies and refreshes the scalp, clearing away buildupPartly supportedLight residue, not heavy build-up.
  • Aloe deeply nourishes and calmsSupportedHelps hair feel hydrated.

Hair Density Scalp Treatment

  • Visibly improves hair thickness, fullness and density in 4 weeks (clinically proven)Stated by brandOnly the brand’s testing shows this.
  • Non-greasy, weightless finish that won't disrupt stylingStated 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.

Scalp-ology Scalp Serum

No review themes researched for this product yet.

Hair Density Scalp Treatment

Multiple reviewers find the mist applicator hard to aim accurately at an 8-10 inch distance and end up spraying it into their hands first to apply it more precisely.

Several reviewers used it specifically to address postpartum shedding, thyroid-related hair loss, or high-stress thinning, and describe renewed growth along the hairline.

A notable minority experience scalp itching, burning, redness, or a rash where the spray lands, with one reviewer describing a recurring allergic reaction.

Many reviewers report visibly thicker, fuller hair and new baby-hair growth along the hairline after consistent use over one to several months.

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.

$5.10/oz vs $21.43/oz — IGK Hair Density Scalp Treatment costs about 4.2× more per ounce than CHI Scalp-ology Scalp Serum.

$1.25/oz median $7.12/oz $55.03/oz $5.10/oz Scalp-ology Scalp Serum $21.43/oz Hair Density Scalp Treatme

Every mark sits on one distribution because these are compared against the same set: 152 scalp treatments with a computable unit price.

Value readScalp-ology Scalp SerumHair Density Scalp Treatment
Label
Priced with its peersSits in the middle of the range for scalp treatments per ounce.
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.

Scalp-ology Scalp Serum vs Scalp-ology Scalp ScrubCHI · 100% function matchHair Density Scalp Treatment vs D.N.A. Scalp Serum for Thinning HairSienna Naturals · 92% function matchScalp-ology Scalp Serum vs Hair Renew Daily Active SerumInnersense Organic Beauty · 95% function matchHair Density Scalp Treatment vs Scalp SerumPATTERN Beauty · 92% function matchScalp-ology Scalp Serum vs Argan Stem Cell Age Defying Scalp IntensiveAndalou Naturals · 92% function matchHair Density Scalp Treatment vs Scalp-ology Scalp ScrubCHI · 92% function matchScalp-ology Scalp Serum vs Scalp Care Soothing SerumMizani · 90% function matchHair Density Scalp Treatment vs Instant Scalp Refresh Anti-Dandruff SpraySheaMoisture · 92% function match

Scalp-ology Scalp Serum · Hair Density Scalp Treatment · All scalp treatments 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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