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FLAWLESS FINISH
Benefits
  • Anti-Wrinkle
  • Firming
  • Lifting
  • Plumping
  • Regenerating
  • Anti-Pigmentation
  • Scar-Repairing
  • Brightening
  • Barrier-Strengthening
  • Hydrating
  • Anti-Inflammatory
  • Microbiome Balancing
  • Anti-Redness

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 the complexion more energised and brighter.

Walnut Extract counteracts skin ageing by stimulating fibroblast activity and inhibiting elastase, preventing natural elastin from degrading and promoting a more elastic, smoother and toned skin with reduced fine lines.

Chaperone Proteins — produced by microorganisms from the Valaus Glacier — support elastin and collagen activity, offering firming and plumping benefits while boosting cellular energy for a brighter complexion.

The Red Seaweed & Tara Fruit Extract Complex forms a flexible, non-occlusive film on the skin that reinforces the barrier and enhances resilience, while Low Molecular Weight Hyaluronic Acid, High Molecular Weight Hyaluronic Acid and a Trio of Polysaccharides deliver hydration at every level of the skin.

The Biologique Recherche Oxygenating Complex completes the formula, enhancing the skin's use of oxygen at a cellular level for a complexion that is visibly plumper, more luminous and thoroughly energised.

Read more

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 the complexion more energised and brighter.

Walnut Extract counteracts skin ageing by stimulating fibroblast activity and inhibiting elastase, preventing natural elastin from degrading and promoting a more elastic, smoother and toned skin with reduced fine lines.

Chaperone Proteins — produced by microorganisms from the Valaus Glacier — support elastin and collagen activity, offering firming and plumping benefits while boosting cellular energy for a brighter complexion.

The Red Seaweed & Tara Fruit Extract Complex forms a flexible, non-occlusive film on the skin that reinforces the barrier and enhances resilience, while Low Molecular Weight Hyaluronic Acid, High Molecular Weight Hyaluronic Acid and a Trio of Polysaccharides deliver hydration at every level of the skin.

The Biologique Recherche Oxygenating Complex completes the formula, enhancing the skin's use of oxygen at a cellular level for a complexion that is visibly plumper, more luminous and thoroughly energised.

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

Red Cross
Not For you if
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

  • - + Anti-Wrinkle
  • - + Firming & Lifting
  • - + Plumping
  • - + Micro-Needling Effect
  • - + Anti-Pigmentation
  • - + Scar-Repairing
  • - + Brightening (Energising)
  • - + Reduces Trans Epidermal Water Loss
  • - + Skin Barrier Strengthening
  • - + Hydrating
  • - + Anti-Inflammatory
  • - + Microbiome Balancing
  • - + Brightening (Oxygenation)
  • - + Anti-Redness
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.

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.

Micro-Needling Effect

Micro-needling effect skincare is designed to stimulate the regeneration of new, healthy skin by activating the skin’s natural repair mechanisms—without the need for needles. Through controlled micro-stimulation, these formulations encourage accelerated cell turnover and boost collagen and elastin production, resulting in firmer, smoother, and more youthful-looking skin. This regenerative process not only softens fine lines and improves skin density, but also helps reduce the appearance of pigmentation and scarring by promoting the renewal of more even, uniform skin. By continuously supporting the formation of fresh skin cells, this approach refines texture, enhances clarity, and reveals a complexion that appears more resilient, radiant, and visibly rejuvenated over time.

Anti-Pigmentation

Dealing with pigmentation means targeting melanin overproduction to reduce dark spots and prevent new ones. Melanin production can be triggered by UV exposure, pollution, hormonal changes (like during pregnancy), and inflammation (from acne or cuts). This excess pigment is then transferred to surrounding cells in epidermis called keratinocytes, which then moves to the skin's surface, causing visible dark spots.

To treat hyperpigmentation, a personalised and consistent approach is needed. Our anti-pigmentation products include lightening agents to block tyrosinase (the enzyme that creates melanin), antioxidants to fight free radicals, and ingredients to speed up skin cell turnover, removing pigmented cells. Using broad-spectrum sun protection is crucial to prevent new pigmentation during treatment.

Scar-Repairing

Anti-Scarring skincare targets the textured scars left by acne breakouts. These scars form due to inflammation disrupting collagen and elastin fibres leading to uneven healing and indented areas. Anti-Scarring actives harness growth factors and exfoliating actives to stimulate cell repair and regeneration, optimising the skin's healing process to reduce scar formation. They also effectively diminish older scars, improving overall skin texture and leaving you with a smoother complexion and significantly reduced scar visibility.

Brightening (Energising)

Brightening skincare involves using active ingredients to boost your blood circulation, detoxification and cellular energy. Improved blood circulation brings more essential nutrients and oxygen to your skin, while detoxification helps eliminate cell waste and impurities that can make your skin look dull. Certain active ingredients also enhance your skin's metabolism and regeneration. These combined actions restore your skin's vitality and radiant appearance, giving you a fresh, energised complexion.

Reduces Trans Epidermal Water Loss

Reducing Trans Epidermal Water Loss (TEWL) is key to maintaining your skin’s optimal hydration levels. By strengthening your skin’s natural barrier, these ingredients prevent water from escaping, keeping your skin well-hydrated and plump. The result is a smoother, more supple complexion with improved texture and resilience, giving you a healthier, more radiant look.

Skin Barrier Strengthening

Strengthening your skin barrier involves replenishing the key elements in the top layer of your skin (stratum corneum), leading to a stronger and healthier barrier. These essential elements include lipids (ceramides, fatty acids, and cholesterol) and Natural Moisturizing Factors (amino acids, hyaluronic acid, etc.). Various factors, such as incorrect skincare use, seasonal changes, and aesthetic treatments, can damage your skin barrier. When this happens, your skin loses excess water through Trans Epidermal Water Loss (T.E.W.L) and becomes less capable of defending against environmental stressors, resulting in dryness, sensitivity, and irritation.

A healthy skin barrier is crucial for overall skin health as it helps prevent hydration loss, protects against environmental damage, and reduces the risk of skin conditions like eczema and acne. By strengthening your skin barrier, you ensure your skin remains well-hydrated, resilient, and protected.

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.

Anti-Inflammatory

Anti-Inflammatory skincare soothes, heal, and balance your skin, the targeted actives are designed to reduce inflammation. Inflammation is your body's natural response to injury or irritation, but continuous inflammation can lead to troublesome skin conditions like acne, rosacea, or eczema. Our anti-inflammatory skincare solutions work to soothe and calm your skin, reducing redness, swelling, and discomfort to provide much-needed relief. By strengthening your skin's barrier, these products help protect against further irritation and damage. Additionally, the anti-inflammatory actives support your skin's natural healing processes, leading to a more balanced and resilient complexion.

Microbiome Balancing

Microbiome Balancing skincare focuses on supporting the skin’s ecosystem through a precise combination of prebiotics, probiotics, and postbiotics—each playing a distinct and complementary role. Prebiotics act as a targeted nutrient source, feeding and promoting the growth of beneficial microorganisms to maintain balance within the skin’s microbiome. Probiotics then introduce and reinforce these beneficial bacteria, helping to strengthen the skin’s natural defenses and reduce the presence of harmful strains. Postbiotics, the bioactive compounds produced through this process, enhance overall skin function by supporting barrier strength, improving hydration, and calming inflammation. Together, this synergistic approach stabilises the skin environment, resulting in a complexion that is clearer, more resilient, and visibly healthier.

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.

Anti-Redness

Anti-Redness skincare is all about reducing and preventing facial or body redness, which can result from irritation, skin conditions, compromised barriers, and hormonal changes. A targeted approach with multiple strategies works best for tackling redness. Anti-Redness formulations include active ingredients that soothe and strengthen your skin barrier. Their anti-inflammatory and antioxidant properties calm inflammation and protect against environmental irritants. Additionally, these ingredients have vasoconstrictive properties, meaning they reduce blood vessel dilation to lessen redness. Together, these actions help achieve a more even-toned, balanced complexion that's less prone to redness flare-ups.

  • - + Anti-Wrinkle
  • - + Firming & Lifting
  • - + Plumping
  • - + Micro-Needling Effect
  • - + Anti-Pigmentation
  • - + Scar-Repairing
  • - + Brightening (Energising)
  • - + Reduces Trans Epidermal Water Loss
  • - + Skin Barrier Strengthening
  • - + Hydrating
  • - + Anti-Inflammatory
  • - + Microbiome Balancing
  • - + Brightening (Oxygenation)
  • - + Anti-Redness

Active Ingredients

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

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

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.

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.

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.

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.

Soybean Phospholipids

Soybean Phospholipids form a protective film on the surface of the skin, allowing the skin to be protected and to retain moisture. Furthermore, this ingredient also helps to restructure and repair cell membranes, allowing the reparation of damaged skin.

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

    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 the complexion more energised and brighter.

    Walnut Extract counteracts skin ageing by stimulating fibroblast activity and inhibiting elastase, preventing natural elastin from degrading and promoting a more elastic, smoother and toned skin with reduced fine lines.

    Chaperone Proteins — produced by microorganisms from the Valaus Glacier — support elastin and collagen activity, offering firming and plumping benefits while boosting cellular energy for a brighter complexion.

    The Red Seaweed & Tara Fruit Extract Complex forms a flexible, non-occlusive film on the skin that reinforces the barrier and enhances resilience, while Low Molecular Weight Hyaluronic Acid, High Molecular Weight Hyaluronic Acid and a Trio of Polysaccharides deliver hydration at every level of the skin.

    The Biologique Recherche Oxygenating Complex completes the formula, enhancing the skin's use of oxygen at a cellular level for a complexion that is visibly plumper, more luminous and thoroughly energised.

    View product