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Side by side

Head & Shoulders Royal Oils Instant Soothe Scalp Elixir vs Nioxin Night density Rescue Serum

90% function match · 8 of the 10 functions we compared match Formula overlap 39%. Head & Shoulders Royal Oils Instant Soothe Scalp Elixir and Nioxin Night density Rescue Serum 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.

  • Royal Oils Instant Soothe Scalp Elixir — protein-sensitive hair
  • Night density Rescue Serum — protein-sensitive 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
Head & Shoulders Royal Oils Instant Soothe Scalp Elixir — 4.2 oz container Head & Shoulders

Royal Oils Instant Soothe Scalp Elixir

  • Scalp treatment
  • Drugstore
  • Sulfate-free
  • Silicone-free
Nioxin Night density Rescue Serum — front of package Nioxin

Night density Rescue Serum

  • Scalp treatment
  • Prestige
  • Sulfate-free
  • Silicone-free
Price, size & price per ounce
$10.75 4.2 oz · $2.56/oz
$38–50 2.3 oz · $21.10/oz
Value / price positioning
Lower cost than most scalp treatments $$$$$ Drugstore tier · costs less than 83% of the 154 scalp treatments we’ve priced
Same job for less elsewhere $$$$$ Prestige tier · costs more than 77% of the 154 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 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
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 Same
Light Water-first and light: unlikely to flatten fine 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
Prominent Fragrance sits in the first eight ingredients — a larger share of the formula. Your hair
Protein Same
None No protein or amino acids in the list. Your hair
None No protein or amino acids in the list. 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
Moderate Your hair
Moderate 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
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
A simple formula
out of 10
A simple formula
Who should choose this
  • Protein-sensitive hairthat stiffens when protein is added
  • Fine hairthat flattens under most products
  • Silicone-free routinesno silicones appear in the list
  • Very dry hairno fast-drying alcohol in the list
  • Protein-sensitive hairthat stiffens when protein is added
  • Fine hairthat flattens under most products
  • Silicone-free routinesno silicones appear in the list
  • Easy to findsold through several channels
Why you might skip it
  • Scents bother youthis product carries a scent
  • Vegan and cruelty-freeour record does not support both claims here
  • Picking it up locallywe have it recorded in one channel only
  • Scents bother youthis product carries a scent
  • Very dry or damaged hairit contains fast-drying alcohol
  • 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
Scalp treatment
Scalp treatmentserum
Where to buy
Brand website
Salons · Specialty beauty · Amazon
Free of
  • sulfate-free
  • silicone-free
  • protein-free
  • curly-method compatible
  • sulfate-free
  • silicone-free
  • protein-free
  • curly-method compatible
Cruelty-free
Not cruelty-free · PETA-listed
Not cruelty-free · PETA-listed
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.

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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

IngredientRoyal Oils Instant Soothe Scalp ElixirNight density Rescue Serum
Water
Neutral
#1Leading
#2Leading
PEG-40 Hydrogenated Castor Oil
Stabilizes
#3Leading
#8Below the 1% line
Menthol
Fragrance
#4Below the 1% line
#6Below the 1% line
Caffeine
Active
#8Below the 1% line
#3Leading
Fragrance
Fragrance
#11Below the 1% line
#5Below the 1% line
Panthenol
Detangles
#14Below the 1% line
#4Supporting

What only one of them carries

Royal Oils Instant Soothe Scalp Elixir

Night density Rescue Serum

Full ingredient list — Royal Oils Instant Soothe Scalp Elixir (16)
Full ingredient list — Night density Rescue Serum (25)

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.

VerdictsRoyal Oils Instant Soothe Scalp ElixirNight density Rescue Serum
Supported
2
1
Partly supported
0
0
Stated by brand
3
0
Potential conflict
0
0

Royal Oils Instant Soothe Scalp Elixir

  • Fresh, cooling leave-in formula invigorates scalp and soothes to provide instant scalp reliefStated by brandCan’t be confirmed from label.
  • 24-hour scalp protection when used as directedStated by brandCan’t be confirmed from label.
  • No-rinse applicationStated by brandCan’t be confirmed from label.
  • Free of sulfates, parabens, and dyesSupportedGentler on colour and coils.
  • Alcohol-free formulaSupportedNothing that flashes off dry.

Night density Rescue Serum

  • Lightweight and non-greasySupportedLess likely to weigh hair down.

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 Night density Rescue Serum draws complaints about irritation.

Royal Oils Instant Soothe Scalp Elixir

Effective remedy for persistent itchy and dry scalp after other products failed

Users with chronic scalp issues including PCOS-related dryness, seborrheic dermatitis, and general flaking

Product contains undisclosed allergens despite marketing claims

One reviewer identified methylhexylisothiazolinone (an allergen illegal in Europe) as the cause of worsened symptoms; another noted benzyl alcohol despite label claiming 'alcohol-free'

Pump applicator is extremely difficult to use and dispenses very little product

User reported inability to pump adequate amounts despite the cute applicator design

Very strong scent can be problematic for sensitive or irritated scalps

Reviewer noted the strong fragrance is inappropriate for a product marketed for scalp sensitivity

Night density Rescue Serum

Users often find the liquid light and non-greasy for overnight application.

US exact-product reviewer accounts; promotional sampling appears in the corpus. Review IDs: 1172115598, 1171689932, 1171580825, 1169661644

Leaking bottles and difficult dispensing recur in packaging complaints.

US exact-product reviewer accounts; promotional sampling appears in the corpus. Review IDs: 1169690823, 1169555383, 1168103122, 1148458466

Some users report scalp tenderness, itching or a burning sensation.

US exact-product reviewer accounts; promotional sampling appears in the corpus. Review IDs: 1172271437, 1169507711, 1153761231

Reports of fuller-looking hair are mixed with reports of no visible difference after several weeks.

US exact-product reviewer accounts; promotional sampling appears in the corpus. Review IDs: 1175637429, 1171789190, 1172271437, 1169661644, 1148458337

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.

$2.56/oz vs $21.10/oz — Nioxin Night density Rescue Serum costs about 8.2× more per ounce than Head & Shoulders Royal Oils Instant Soothe Scalp Elixir.

$1.25/oz median $7.19/oz $55.03/oz $2.56/oz Royal Oils Instant Soothe $21.10/oz Night density Rescue Serum

Every mark sits on one distribution because these are compared against the same set: 154 scalp treatments with a computable unit price.

Value readRoyal Oils Instant Soothe Scalp ElixirNight density Rescue Serum
Label
Lower cost than most scalp treatmentsCosts less per ounce than most scalp treatments we have researched.
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.

Royal Oils Instant Soothe Scalp Elixir vs Lavender Lychee Scalp Lightweight Soothing Scalp and Hair RefresherMielle · 92% function matchNight density Rescue Serum vs Scalp Care Soothing SerumMizani · 100% function matchRoyal Oils Instant Soothe Scalp Elixir vs Scalp & Skin TonerRahua · 92% function matchNight density Rescue Serum vs The Treatment Scalp SerumKilgourMD · 95% function matchRoyal Oils Instant Soothe Scalp Elixir vs Women's REVIVE+ Densifying Treatment FoamBosley · 92% function matchNight density Rescue Serum vs Age Defense SerumNioxin · 95% function matchRoyal Oils Instant Soothe Scalp Elixir vs Age Defense SerumNioxin · 90% function matchNight density Rescue Serum vs Scalp Revival Charcoal + Tea Tree Scalp TreatmentBriogeo · 95% function match

Royal Oils Instant Soothe Scalp Elixir · Night density Rescue Serum · 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.
  • 11 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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