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Side by side

Bigen Silkening Shine Serum vs Kérastase Kérastase Elixir Ultime Refillable Hydrating Hair Oil

92% function match · 10 of the 12 functions we compared match Formula overlap 52%. Bigen Silkening Shine Serum and Kérastase Kérastase Elixir Ultime Refillable Hydrating Hair Oil 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.

  • Silkening Shine Serum — protein-sensitive hair
  • Kérastase Elixir Ultime Refillable Hydrating Hair Oil — 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
Bigen Silkening Shine Serum — 3.38 oz container Bigen

Silkening Shine Serum

  • Finisher
  • Drugstore
  • Sulfate-free
  • Protein-free
Kérastase Kérastase Elixir Ultime Refillable Hydrating Hair Oil — 2.5 oz container Kérastase

Kérastase Elixir Ultime Refillable Hydrating Hair Oil

  • Finisher
  • Prestige
  • Sulfate-free
  • Protein-free
Price, size & price per ounce
$7.99 3.3 oz · $2.57/oz
$30 2.5 oz · $12.00/oz
Value / price positioning
Lower cost than most serums $$$$$ Drugstore tier · costs less than 85% of the 79 serums we’ve priced
Upper-mid price for a hair oil $$$$$ Prestige tier · costs more than 60% of the 175 hair oils we’ve priced
Best for hair types
Curly–Coily A heavy formula: coarse, curlier strands carry it without flattening. Your hair
Curly–Coily A heavy formula: coarse, curlier strands carry it without flattening. Your hair
Moisture level Same
High Humectants near the top — water-binding is a headline mechanism here. Your hair
Moderate Humectants in the working part of the formula. Your hair
Shine system Same
High A silicone or oil blend does the shine work here. Your hair
High A silicone or oil blend does the shine work here. Your hair
Slip / detangling
Some Some slip, mostly from esters or silicones rather than conditioners. Your hair
Some Some slip, mostly from esters or silicones rather than conditioners. Your hair
Weight on hair Same
Rich Heavy butters and waxes in the first eight ingredients. Your hair
Rich Heavy butters and waxes in the first eight ingredients. 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
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
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
Oils and butters Differs
Rich Butters near the top: a heavy, softening formula. Your hair
Present, high in the list Oils sit high in the list — a softening, coating formula. Your hair
Fast-drying alcohol Same
None No fast-drying alcohol in the list. Your hair
None No fast-drying alcohol in the list. Your hair
Humidity resistance
—
Claimed The brand claims humidity resistance; the ingredient list cannot confirm it. Your hair
Formula completeness
out of 10
Covers the core
out of 10
Complete for its job
Who should choose this
  • Protein-sensitive hairthat stiffens when protein is added
  • Coarse or dry hairthat absorbs everything you give it
  • Dull-looking haira recognised shine system is present
  • Very dry hairno fast-drying alcohol in the list
  • Protein-sensitive hairthat stiffens when protein is added
  • Coarse or dry hairthat absorbs everything you give it
  • Dull-looking haira recognised shine system is present
  • Humid climatesthe brand claims humidity resistance
Why you might skip it
  • Scents bother youthis product carries a scent
  • Curly-method routinesthese silicones need a detergent to remove
  • Oily scalp or fine hairthat gets weighed down
  • Scents bother youthis product carries a scent
  • Curly-method routinesthese silicones need a detergent to remove
  • Oily scalp or fine hairthat gets weighed down
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
Finisherserum
Finisheroil
Where to buy
Beauty supply · Brand website · Amazon
Brand website · Kohl'S
Free of
  • sulfate-free
  • protein-free
  • sulfate-free
  • protein-free
Cruelty-free
—
Not cruelty-free · PETA-listed
Scent
Scented, not described
Scented, not described
Finish
—
shine
Humidity claim
—
Yes
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

IngredientSilkening Shine SerumKérastase Elixir Ultime Refillable Hydrating Hair Oil
Dimethicone
Buildup
#2Leading
#2Leading
Dimethiconol
Buildup
#3Leading
#5Supporting
Argania Spinosa Kernel Oil
Shine
#5Supporting
#9Secondary
Amodimethicone
Buildup
#9Below the 1% line
#6Supporting
Fragrance
Fragrance
#10Below the 1% line
#21Below the 1% line

What only one of them carries

Silkening Shine Serum

Kérastase Elixir Ultime Refillable Hydrating Hair Oil

Full ingredient list — Silkening Shine Serum (11)
Full ingredient list — Kérastase Elixir Ultime Refillable Hydrating Hair Oil (21)

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.

VerdictsSilkening Shine SerumKérastase Elixir Ultime Refillable Hydrating Hair Oil
Supported
0
1
Partly supported
0
0
Stated by brand
0
4
Potential conflict
0
0

Silkening Shine Serum

No claims recorded for this product beyond the ones above.

Kérastase Elixir Ultime Refillable Hydrating Hair Oil

  • instant softness and easier stylingStated by brandSubjective feel varies by hair.
  • controls frizz and flyawaysStated by brandMay help, but not a primary focus.
  • up to 92% more shineStated by brandOnly the brand’s testing shows this.
  • heat protection up to 450°FStated by brandOnly lab testing can show this.
  • helps protect lengths from humiditySupportedSmoother strands, less frizz.

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 a light feel and shine.

Silkening Shine Serum

Leaves hair shiny, soft, manageable, not oily/greasy

Feels light and shiny

Leaves hair soft and shiny, reviewer 'in love with this product'

Kérastase Elixir Ultime Refillable Hydrating Hair Oil

A curly, fine-haired reviewer says a small amount softens and polishes the ends while taming frizz without making hair look oily.

curly, fine hair used as an ends finisher

A color-treated, fine-haired reviewer reports shine without a greasy finish and says it improved the look of damaged hair over several days.

fine, color-treated damaged hair

A reviewer with dry, thick hair says the oil made hair less frizzy and visibly shinier.

dry, thick 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.

$2.57/oz vs $12.00/oz — Kérastase Kérastase Elixir Ultime Refillable Hydrating Hair Oil costs about 4.7× more per ounce than Bigen Silkening Shine Serum.

Silkening Shine Serum

Against 79 serums with a computable unit price.

Kérastase Elixir Ultime Refillable Hydrating Hair Oil

Against 175 hair oils with a computable unit price.

Value readSilkening Shine SerumKérastase Elixir Ultime Refillable Hydrating Hair Oil
Label
Lower cost than most serumsCosts less per ounce than most serums we have researched.
Upper-mid price for a hair oilSits in the middle of the range for hair oils 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.

Silkening Shine Serum vs Hairdresser's Invisible OilBumble and bumble · 96% function matchKérastase Elixir Ultime Refillable Hydrating Hair Oil vs Gloss Mode Treatment Oile.l.f. Hair · 100% function matchSilkening Shine Serum vs Hairdresser's Invisible Oil Frizz Reducing Hair OilBumble and bumble · 96% function matchKérastase Elixir Ultime Refillable Hydrating Hair Oil vs Valour Restorative Smoothing Hair SerumOliere Paris · 100% function matchSilkening Shine Serum vs Gloss Mode Treatment Oile.l.f. Hair · 92% function matchKérastase Elixir Ultime Refillable Hydrating Hair Oil vs Hydrating Healing Hair OilVirtue · 100% function matchSilkening Shine Serum vs Hydrating Healing Hair OilVirtue · 92% function matchKérastase Elixir Ultime Refillable Hydrating Hair Oil vs Sleek & Shine Moroccan Sleek Oil TreatmentGarnier Fructis · 96% function match

Silkening Shine Serum · Kérastase Elixir Ultime Refillable Hydrating Hair Oil · All serums 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.
  • 4 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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