Sérum Yall~O2 Fundamental Hydration Elixir

Biologique Recherche

Where to buy Possibly in stock

About this product

The Biologique Recherche Sérum Yall~O2 Fundamental Hydration Elixir is a serums, essence, ampoule. Our analysis of its 35 ingredients (24 low-risk) rates it Excellent (92/100). Based on its ingredients, it looks well-suited to dry skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
35
Low-risk
24
Fragrance
Fragrance-free
Origin
France
Data updated
Jun 2026

The evidence

Quick Product Notes

Paraben-Free Sulfate-Free Alcohol-Free Silicone-Free EU Allergen-Free Fungal Acne (Malassezia) Safe

Notable Effects & Ingredients

No Notable Effects & Ingredients

Ingredients Related to Skin Types

Good   Bad — tap a skin type to see which ingredients · estimated from ingredient functions
Dry Skin 8/6
Good for dry skin
C13-14 Isoparaffin Anhydroxylitol Isocetyl Stearate Xylitol Xylitylglucoside Sodium Hyaluronate Propylene Glycol Coco-Caprylate
Caution for dry skin
Rhizobian Gum Maltodextrin Sorbitan Isostearate Xanthan Gum Laureth-7 Polysorbate 60
Oily/Acne-Prone Skin No data
Sensitive Skin 1/7
Good for sensitive skin
Sodium Metabisulfite
Caution for sensitive skin
Propylene Glycol Citric Acid Sodium Benzoate Acacia Senegal Gum Potassium Sorbate Phenoxyethanol Limonene

Ingredients list

35 total
Lower hazard (1) Higher hazard (6)
All35 Skin Conditioning22 Fragrance7 Humectant7 Film Forming7 Preservative5 Emulsion Stabilising5 Solvent5 Viscosity Controlling4
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
4
Perfluorodecalin
(Skin Conditioning, Solvent, Detangling)
B
Coco-Caprylate
(Emollient)
1
B
Isocetyl Stearate
(Skin Conditioning, Emollient)
Bad for Oily Skin
Bad for Oily Skin
Fungal Acne
Fungal Acne Trigger
1
A
Maltodextrin
(Absorbent, Binding Agent, Emulsion Stabilising, Film Forming, Hair Conditioning, Skin Conditioning, Suspending Agent Nonsurfactant, Binding)
1
Xylitylglucoside
(Humectant, Skin Conditioning)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
Anhydroxylitol
(Humectant, Skin Conditioning)
6
Polyperfluoromethylisopropyl Ether
(Skin Conditioning)
1
Xylitol
(Flavoring Agent, Humectant, Skin Conditioning)
2
A
Poloxamer 188
(Antimicrobial Agent, Sufactant)
1
A
Rhizobian Gum
(Film Forming, Hair Fixing, Plasticizer, Suspending Agent Nonsurfactant, Viscosityincreasing Agent Aqueous, Viscosity Controlling)
Punica Granatum Fruit Extract
(Skin Conditioning)
3
A
Acacia Senegal Gum
(Adhesive, Fragrance, Film Forming, Masking)
1
Lilium Candidum Flower Extract
(Skin Conditioning)
Juglans Regia Seed Extract
(Skin Conditioning)
1
Hibiscus Sabdariffa Flower Extract
(Skin Conditioning)
Juglans Regia Shell Extract
(Skin Conditioning)
Carum Carvi Fruit Oil
(Fragrance, Perfuming)
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
3
B
Propylene Glycol
(Fragrance, Humectant, Skin Conditioningagent Miscellaneous, Solvent, Viscosity Decreasing Agent, Skin Conditioning, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
4
B
Polyacrylamide
(Binding Agent, Film Forming, Hair Fixing, Antistatic Agent, Binding)
1
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
(Emulsion Stabilising, Viscosity Controlling)
1
B
C13-14 Isoparaffin
(Emollient, Solvent)
2
A
Chlorphenesin
(Cosmetic Biocide, Antimicrobial, Preservative)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
1
A
Ethylhexylglycerin
(Deodorant, Skin Conditioning)
3
B
Laureth-7
(Emulsifying, Surfactant)
3
A
Sodium Benzoate
(Fragrance, Preservative, Anticorrosive, Masking)
1
A
Sorbitan Isostearate
(Emulsifying, Surfactant)
3
B
Polysorbate 60
(Emulsifying, Surfactant)
Fungal Acne
Fungal Acne Trigger
4
A
Phenoxyethanol
(Fragrance, Preservative)
Paraben
Paraben
3
A
Potassium Sorbate
(Fragrance, Preservative)
4
A
Sodium Metabisulfite
(Antioxidant, Preservative, Reducing)
6
Limonene
(Deodorant, Perfuming, Solvent)
Allergens
Allergens

My Ingredient Notes

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Key ingredients

Antioxidants
Shields skin from free radical damage.
Hyaluronic Acid
Hydrates by attracting and holding water.

Benefits

HydratingBoosts hydration and relieves dry, tight skin.
Barrier RepairStrengthen and restore your skin's natural barrier.
Anti-AgingSoftens lines and helps skin look youthful.
Reduces IrritationEases discomfort and supports skin resilience.
Redness ReducingSoothes visible redness and calms irritation.
Dark SpotsFades dark spots for even skin tone.
Show all 6 benefits

Concerns

Contains paraben
Contains eu allergen
Not fungal acne (malassezia) safe
May not suit sensitive skin

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Perfluorodecalin
Skin conditioning, Solvent
Low-to-moderate hazard.Read moreShow less
EWG 4 Skin conditioningSolventDetangling
Coco-Caprylate
Emollient
Limited public safety data.Read moreShow less
EWG N/A CIR B Emollient
Maltodextrin
Absorbent, Binding agent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A AbsorbentBinding agentEmulsion stabilisingFilm formingHair conditioningSkin conditioningSuspending agent - nonsurfactantBinding
Xylitylglucoside
Humectant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 HumectantSkin conditioning
Anhydroxylitol
Humectant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 HumectantSkin conditioning
Xylitol
Flavoring agent, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 Flavoring agentHumectantSkin conditioning
Poloxamer 188
Antimicrobial agent, Sufactant
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A Antimicrobial agentSufactant
Rhizobian Gum
Film forming, Hair fixing
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Film formingHair fixingPlasticizerSuspending agent - nonsurfactantViscosityincreasing agent - aqueousViscosity controlling
Punica Granatum Fruit Extract
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Acacia Senegal Gum
Adhesive, Fragrance
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A AdhesiveFragranceFilm formingMasking
Lilium Candidum Flower Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Juglans Regia Seed Extract
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Hibiscus Sabdariffa Flower Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Juglans Regia Shell Extract
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
+ 12 more — see the full ingredients list above
Isocetyl Stearate
Skin conditioning, Emollient
Potentially comedogenic - can block poresRead moreShow less
EWG 1 CIR B Skin conditioningEmollient Bad for Oily SkinFungal-acne trigger
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
Polyperfluoromethylisopropyl Ether
Skin conditioning
Moderate-hazard ingredient.Read moreShow less
EWG 6 Skin conditioning
Citric Acid
Chelating agent, Fragrance
Skin irritation can occur at high concentrationRead moreShow less
EWG 2 CIR A Chelating agentFragrancePh adjusterBuffering agentMasking Bad for Sensitive Skin
Propylene Glycol
Fragrance, Humectant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B FragranceHumectantSkin-conditioningagent - miscellaneousSolventViscosity decreasing agentSkin conditioningViscosity controlling Good for Dry Skin
Polysorbate 60
Emulsifying, Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B EmulsifyingSurfactant Fungal-acne trigger
Phenoxyethanol
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR A FragrancePreservative Paraben
Limonene
Deodorant, Perfuming
Moderate-hazard ingredient.Read moreShow less
EWG 6 DeodorantPerfumingSolvent Allergens

How to use

How to use

  • 1 Where it fits: Apply after toner and before moisturiser — thinnest to thickest.
  • 2 Morning & evening: Suitable for both AM and PM use.

General guidance from this product's category and active ingredients — always follow the directions on the package.

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