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  • Eye Care
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FLAWLESS FINISH
Benefits
  • Hydrating
  • Nourishing
  • Plumping
  • Brightening
  • Anti-Wrinkle
  • Firming
  • Lifting
  • Repairing
  • Anti-Ageing
  • Antioxidant
  • Anti-Senescence
  • Cell Communication

The Biologique Recherche Serum Yall O2 is a rich face oil that plumps, hydrates, and regenerates the skin. It combats dehydration and signs of ageing by enhancing skin fullness leaving you with a more energised and brighter complexion.

Read more

The Biologique Recherche Serum Yall O2 is a rich face oil that plumps, hydrates, and regenerates the skin. It combats dehydration and signs of ageing by enhancing skin fullness leaving you with a more energised and brighter complexion.

Read less

30 ml

£302
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More Info

  • - + Who it is for
  • - + How to Apply
  • - + Ingredients
  • - + Smell & Texture
  • - + About the Brand
  • - + Who it is for
  • - + How to Apply
  • - + Ingredients
  • - + Smell & Texture
  • - + About the Brand
Who it is for
Green tick
For you if

Dry Skin

Loss of Volume

Loss of Firmness

Dull Skin

Wrinkles

Volume Loss

How to Apply
Apply a few drops of Sérum Yall~02 to the entire face, neck and décolleté in the morning and/or in the evening. Alternatively, a few drops can also be mixed into your face cream.
Ingredients

Scroll down the page for a full breakdown of the active ingredients.

Water (Aqua), Glycerin, Methylpropanediol, Isocetyl Stearate, Dicaprylyl Carbonate, Maltodextrin, Perfluorodecalin, Bentonite, Hydrolyzed Lupine Protein, Caesalpinia Spinosa Fruit Extract, Kappaphycus Alvarezii Extract, Juglans Regia (Walnut) Seed Extract, Glycine Soja (Soybean) Oil, Sodium Hyaluronate, Serine, Citric Acid, Algin, Glyceryl Polyacrylate, Pullulan, Tocopherol, Trehalose, Pentylene Glycol, Sorbitan Isostearate, Succinic Acid, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Urea, Isohexadecane, Polyperfluoromethylisopropyl Ether, Poloxamer 188, Polysorbate 60, Disodium Phosphate, Potassium Phosphate, Caprylyl Glycol, Phenylpropanol, Phenoxyethanol, Sodium Benzoate, Benzoic Acid, Sodium Metabisulfite, Sorbic Acid.

*This product contains nut-derived ingredients and should be avoided by individuals with nut allergies.


Please note: The ingredients listed in this product are subject to change as the formulation is updated. We aim to update the INCI list as soon as possible, but we encourage you to read the ingredient list on the product itself to ensure it's suitable for your personal use.

Smell & Texture

Smells Like: A neutral scent with hints of botanical notes.

Texture: It has a watery, liquid texture.

About the Brand
Brand logo
Founded in Paris in the late 1970s by biologist Yvan Allouche and physiotherapist Josette Allouche, Biologique Recherche began as a laboratory for bespoke, high-performance formulas for elite skin professionals. Their medical-grade precision and artisanal formulation, paired with consummate savoir-faire, underpin their reputation for outstanding, clinically proven results.

Biologique Recherche treats skin according to its Skin Instant©, the skin’s precise, evolving state. Each formula is loaded with active ingredients in exceptional concentrations, then prescribed to address those real-time needs. This precision approach corrects imbalances, restores function, and delivers visible, lasting transformation.

Cold-processed actives are the core of Biologique Recherche. Formulated at 18–25°C, this method avoids the 70°C heat of standard processing that breaks down actives. Botanical, marine, and biotechnological extracts stay intact for higher absorption, stronger repair, and better tolerance. Antioxidants, peptides, and enzymes remain stable, ensuring consistent, visible results.

The Benefits

  • - + Nourishing
  • - + Hydrating
  • - + Brightening (Oxygenation)
  • - + Plumping
  • - + Anti-Wrinkle
  • - + Firming & Lifting
  • - + Antioxidant
  • - + Anti-Ageing (Senescence)
  • - + Cell Communication
Nourishing

Nourishing skincare focuses on replenishing the skin with essential lipids, nutrients, and bioactive compounds to restore comfort, resilience, and optimal function. When the skin is depleted—whether through environmental stress, over-exfoliation, or natural ageing—it can become dry, fragile, and less able to protect itself. Nourishing formulations work to rebuild the lipid barrier using ingredients rich in fatty acids, vitamins, and antioxidants, helping to reinforce the skin’s structure while supporting repair and reducing moisture loss. By restoring what the skin lacks, this approach leaves it softer, stronger, and more supple.

Hydrating

Hydration is a fundamental part of healthy skincare, focusing on maintaining and restoring the skin’s water content. Well-hydrated skin appears plump, smooth and radiant, while dehydration can lead to dullness, tightness, fine lines and increased sensitivity.
Hydrating the skin can work through a fascinating mix of ingredients with different roles. Humectants like hyaluronic acid and glycerin act like water magnets, pulling water into the skin to instantly plump and smooth, while Natural Moisturizing Factors (NMFs)—such as urea, amino acids and sodium PCA—mimic the skin’s own hydration system, helping it hold onto water and stay balanced from within.
Adding humectants like hyaluronic acid to your routine will restore your skin's healthy glow, minimize fine lines, and provide a plumping effect.

Brightening (Oxygenation)

Brightening your skin means restoring its natural glow. One way to do this is through oxygenation, which helps skin cells "breathe" better by delivering more oxygen. Perfluorocarbons are key ingredients that carry oxygen into the skin cells. This process also boosts blood circulation and removes skin cell waste, resulting in brighter, more radiant skin.

Plumping

Plumping involves using active ingredients to boost the production of key structural components like collagen, the dermal-epidermal junction and glycosaminoglycans (GAGs), giving your skin more volume and density. Collagen provides structural support and firmness, while the dermal-epidermal junction, a thin connective layer, ensures smooth, wrinkle-free skin by facilitating cell communication. GAGs, like hyaluronic acid, keep your skin hydrated and plump from within. By stimulating these components, active ingredients help restore your skin's plumpness and radiance.

Anti-Wrinkle

Anti-wrinkle skincare is focused on both preventing and visibly reducing the formation of lines by targeting the structural and dynamic causes of wrinkles within the skin. Fine lines and deeper wrinkles develop as collagen and elastin decline, cell turnover slows and repeated facial movements create creases that become etched over time. Advanced formulations address these mechanisms through a combination of elastin-stimulating actives, smoothing peptides that help relax the appearance of expression lines, and deeply hydrating ingredients that plump the skin from within. By reinforcing the skin’s architecture while softening surface contractions and improving elasticity, anti-wrinkle skincare delivers a visibly smoother complexion.

Firming & Lifting

Firming & Lifting skincare is designed to restore strength, structure, and definition to the skin, creating a visibly tighter, more sculpted appearance. As the skin loses collagen and elasticity over time, it can begin to soften and sag, losing its natural contours. Advanced formulations work to rebuild this support from within—boosting firmness while helping to visibly lift and redefine the skin. The result is a smoother, more toned complexion with enhanced bounce and resilience, where facial contours appear sharper and elevated.

Antioxidant

Antioxidant skincare is dedicated to protecting the skin against oxidative stress—one of the primary drivers of premature ageing and cellular damage—while preserving overall skin integrity and vitality. These formulations rely on potent molecules such as vitamin C, vitamin E, and polyphenols, which neutralize free radicals generated by UV exposure and environmental aggressors before they can compromise cellular structures like lipids, proteins, and DNA. Beyond defence, many antioxidants also support repair processes and enhance collagen stability, contributing to improved firmness, brightness and resilience. The result is skin that is not only shielded from ongoing damage but maintained in a healthier, more luminous state over time.

Anti-Ageing (Senescence)

Anti-senescence skincare represents a new frontier in skin longevity, focusing on slowing and reversing the accumulation of “retired” cells that no longer contribute to renewal but actively accelerate ageing. These senescent cells release inflammatory signals and degradative enzymes that weaken the skin’s structure, leading to loss of firmness, uneven tone, and the formation of wrinkles. Advanced anti-senescence formulations are designed to target this process at a cellular level—helping to limit the formation of these dysfunctional cells, neutralize their harmful effects, and support the regeneration of healthy, active ones. By restoring a more youthful cellular environment, this approach goes beyond traditional anti-ageing, promoting skin that appears smoother, stronger, and visibly revitalized over time.

Cell Communication

Cell-communicating ingredients support the skin by enhancing the dialogue between its cells, helping them function in a more intelligent and responsive way. Advanced actives such as growth factors, peptides and plant stem cells act as molecular messengers, signalling to skin cells and encouraging them to repair, regenerate and protect themselves against environmental stress and the visible effects of ageing.

When delivered topically in well-formulated skincare, these ingredients help stimulate essential processes such as collagen production, cellular renewal and barrier repair. The result is skin that appears stronger, smoother and more resilient over time. For these ingredients to perform optimally, they must also be bioavailable meaning the skin can readily recognise, absorb and utilise them. The closer an ingredient’s structure is to that of human skin cells, the more effectively it can interact with the skin’s natural biology, allowing it to deliver meaningful and visible results.

  • - + Nourishing
  • - + Hydrating
  • - + Brightening (Oxygenation)
  • - + Plumping
  • - + Anti-Wrinkle
  • - + Firming & Lifting
  • - + Antioxidant
  • - + Anti-Ageing (Senescence)
  • - + Cell Communication

Active Ingredients

  • - + Low Molecular Weight Hyaluronic Acid
  • - + Biologique Recherche Oxygenating Complex
  • - + Polysaccharides
  • - + Walnut Extract
  • - + Chaperone Proteins
  • - + High Moleclular Weight Hyaluronic Acid (Hyaluronic Acid)
  • - + Red Seaweed & Tara Fruit Extract Complex
Low Molecular Weight Hyaluronic Acid

Low Molecular Weight Hyaluronic Acid (LMW-HA) is a smaller, more penetrative form of hyaluronic acid. Unlike high molecular weight forms that primarily hydrate the skin’s surface, LMW-HA has the ability to penetrate deeper into the epidermis, where it attracts and binds water to maintain optimal moisture levels from within. This deep hydration helps improve skin elasticity, firmness and smoothness, while reducing the appearance of fine lines and dehydration-induced wrinkles. Additionally, it enhances overall suppleness, making the complexion look plumper and more resilient. It is ideal for dehydrated, dull or mature skin, and especially those in need of long-lasting hydration and improved texture.

Biologique Recherche Oxygenating Complex

Biologique Recherche's "Oxygenating Complex" utilises Perfluorodecalin to enhance cellular respiration by delivering oxygen deep into the skin. This ingredient effectively carries oxygen to the skin's deepest layers, promoting rejuvenation, plumping, reducing wrinkles, and brightening the complexion.

Polysaccharides

Polysaccharides are naturally occurring long-chain carbohydrates derived from plants, algae, fungi, or biotechnological fermentation. They are valued for their ability to hydrate, soothe, and protect the skin through their humectant and film-forming properties. By attracting and retaining moisture, they help strengthen the skin barrier, reduce transepidermal water loss, and leave the complexion feeling soft and supple. Many polysaccharides also possess soothing and anti-inflammatory effects, helping to calm irritation and support the skin’s natural repair processes, while some act as prebiotics to promote a balanced microbiome. They are especially beneficial for dry, sensitive, dehydrated, or compromised skin, as well as those exposed to environmental stressors.

Walnut Extract

Walnut Extract counteracts skin ageing by stimulating fibroblast activity and inhibiting elastase. Meaning that it prevents the natural elastin in our skin from degrading, promoting a more elastic and smoother skin, whilst reducing fine lines & wrinkles and promoting a more toned skin. This ingredient also has powerful antioxidant properties which prevents cells from oxidative stress.

Chaperone Proteins

Chaperone Proteins, produced by microorganisms from the Valaus Glacier, have adapted to survive in extremely harsh conditions. In skincare, they support Elastin & Collagen activity, offering firming and plumping benefits. Additionally, they boost cellular energy, resulting in a brighter complexion.

High Moleclular Weight Hyaluronic Acid (Hyaluronic Acid)

High Molecular Weight Hyaluronic Acid has a larger molecular size (>1000kDA), which tends to sit on the top layer of the skin, providing surface hydration and improving water retention. It acts as a potent humectant, drawing hydration from the environment into the skin, which helps to plump and smooth the skin's surface texture. Its larger size limits its ability to penetrate deeply into the skin compared to lower molecular weight Hyalurons, making it ideal for providing surface-enhancing hydration provided from other forms of hyalurons and maintaining skin suppleness.

Red Seaweed & Tara Fruit Extract Complex

Red Seaweed and Tara Fruit Extract Complex combines a warm-water red algae native to Southeast Asia with Tara fruit extract, revered in South America as the “green gold of the Incas.” Rich in natural biopolymers, this complex forms a flexible, non-occlusive film on the skin or scalp surface, creating an invisible protective mesh. Its biomimetic structure reinforces the skin barrier, enhances resilience, and provides biomechanical protection against environmental stressors, all while maintaining breathability and comfort.

  • - + Low Molecular Weight Hyaluronic Acid
  • - + Biologique Recherche Oxygenating Complex
  • - + Polysaccharides
  • - + Walnut Extract
  • - + Chaperone Proteins
  • - + High Moleclular Weight Hyaluronic Acid (Hyaluronic Acid)
  • - + Red Seaweed & Tara Fruit Extract Complex
The Biologique Recherche Proprietary Oxygenating Complex

Biologique Recherche's proprietary Oxygenating Complex is a powerful skincare ingredient known for its rejuvenating properties. It enhances cellular respiration and promotes better tissue oxygenation, which helps boost the efficacy of other active ingredients.

It contains perfluorodecalin, a compound renowned for its ability to transport oxygen. It stimulates cellular exchange to replenish oxygen-deprived skin, resulting in improved skin vitality and enhanced absorption of skincare products.

This advanced formulation is particularly suited to city workers, smokers and those with stressed or dull skin, leading to a more radiant and healthier complexion with boosted cellular function.

Clinical Proofs

Skin radiance
The measurements show that, after just 30 minutes of application, Fluide VIP O2 increase
complexion radiance by 1.5%
*Test conducted on 20 volunteers with asphyxiated, dull skin. Measurements were taken with a chromameter, 30
minutes after a single application of the product, to assess the Chroma C* parameter, which corresponds with
the skin’s radiance.
USAGE TEST
*Test conducted on 20 women aged 23 to 66 with asphyxiated, dull skin for 4 weeks, with twice-daily application.

95% of women felt their skin was moisturised
90% of women felt their skin was more supple, brighter, oxygenated and its radiance was
restored
85% of women felt their skin was healthier and protected against external stress factors
80% of women felt their skin was revitalized, clearer and their complexion evened out
80% of women felt the product enhanced their skin’s natural resilience
70% of women felt their skin’s silky glow was revealed

* The above information has been supplied to the Embassy of Beauty by the brand manufacturer. Embassy of Beauty takes no responsibility for these claimed studies and or results.

Spotlight

The Biologique Recherche Proprietary Oxygenating Complex

Biologique Recherche's proprietary Oxygenating Complex is a powerful skincare ingredient known for its rejuvenating properties. It enhances cellular respiration and promotes better tissue oxygenation, which helps boost the efficacy of other active ingredients.

It contains perfluorodecalin, a compound renowned for its ability to transport oxygen. It stimulates cellular exchange to replenish oxygen-deprived skin, resulting in improved skin vitality and enhanced absorption of skincare products.

This advanced formulation is particularly suited to city workers, smokers and those with stressed or dull skin, leading to a more radiant and healthier complexion with boosted cellular function.

Clinical Proofs

Clinical Proofs

Skin radiance
The measurements show that, after just 30 minutes of application, Fluide VIP O2 increase
complexion radiance by 1.5%
*Test conducted on 20 volunteers with asphyxiated, dull skin. Measurements were taken with a chromameter, 30
minutes after a single application of the product, to assess the Chroma C* parameter, which corresponds with
the skin’s radiance.
USAGE TEST
*Test conducted on 20 women aged 23 to 66 with asphyxiated, dull skin for 4 weeks, with twice-daily application.

95% of women felt their skin was moisturised
90% of women felt their skin was more supple, brighter, oxygenated and its radiance was
restored
85% of women felt their skin was healthier and protected against external stress factors
80% of women felt their skin was revitalized, clearer and their complexion evened out
80% of women felt the product enhanced their skin’s natural resilience
70% of women felt their skin’s silky glow was revealed

* The above information has been supplied to the Embassy of Beauty by the brand manufacturer. Embassy of Beauty takes no responsibility for these claimed studies and or results.

Why I love it

  • "The efficacy of Biologique Recherche relies not only on its science-driven approach to balancing and curing the skin, but on its prescriptive and tailored nature."

    X Natalie K-F

    Founder, Embassy of Beauty

  • Biologique Recherche Sérum Yall~O2: Plumping and Revitalising Finishing Serum with Hyaluronic Acid
    Biologique Recherche

    Serum Yall~O2

    £302

    The Biologique Recherche Serum Yall O2 is a rich face oil that plumps, hydrates, and regenerates the skin. It combats dehydration and signs of ageing by enhancing skin fullness leaving you with a more energised and brighter complexion.

    View product