Clé de Peau Beauté
Synactif Neck & Décolleté Cream
Synactif Neck & Décolleté Cream
Clé de Peau Beauté
synactif-neck-decollete-cream
Moisturize
9605079335205
Morning or Evening?
How often will you use this product?
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Highlights
WHAT IS IT?
A neck and décolleté cream
FEATURES
Intensely firms and brightens, provides 24-hour long-lasting moisture, targets age-related skin concerns
BEST FOR
Not specified
CHECKS
Does not contain information provided
Who Is It For?
Not Specified Likely For AdultsWhat Does It Help With?
Dullness Dryness Wrinkles And SaggingBudget
PremiumHow To Use
Which routine should it be used in?
Instructions:
Key Information
What Clé de Peau Beauté Says
Product Description:
A breakthrough dual-action cream that intensely firms and brightens the neck and décolletage for vibrant, supple skin.
About the Brand:
Ingredients Overview
Ingredients List
AQUA･PENTAERYTHRITYL TETRAETHYLHEXANOATE･SQUALANE･BUTYLENE GLYCOL･GLYCERIN･BEHENYL ALCOHOL･DIMETHICONE･DIPROPYLENE GLYCOL･DIPHENYLSILOXY PHENYL TRIMETHICONE･SILICA･XYLITOL･POTASSIUM METHOXYSALICYLATE･BETAINE･STEARYL ALCOHOL･HYDROGENATED PALM OIL･BEHENETH-20･HYDROGENATED POLYISOBUTENE･PHENOXYETHANOL･MYRISTYL MYRISTATE･POLYVINYL ALCOHOL･MICROCRYSTALLINE WAX(CERA MICROCRISTALLINA/CIRE MICROCRISTALLINE)･DIMETHICONE/PHENYL VINYL DIMETHICONE CROSSPOLYMER･ELAEIS GUINEENSIS (PALM) KERNEL OIL･DIMETHYLACRYLAMIDE/SODIUM ACRYLOYLDIMETHYLTAURATE CROSSPOLYMER･ELAEIS GUINEENSIS (PALM) OIL･FRAGRANCE (PARFUM)･ALCOHOL･DISODIUM EDTA･TOCOPHERYL ACETATE･RETINYL ACETATE･SODIUM CITRATE･HELIANTHUS ANNUUS (SUNFLOWER) SEED OIL･BHT･POLYQUATERNIUM-51･HYDROXYPROLINE･SODIUM METAPHOSPHATE･SODIUM METABISULFITE･BUTYLPHENYL METHYLPROPIONAL･CITRIC ACID･PEG/PPG-17/4 DIMETHYL ETHER･ALLANTOIN･ISOSTEARIC ACID･LINALOOL･IRON OXIDES (CI 77492)･CITRONELLOL･GERANIOL･IRON OXIDES (CI 77491)･LAURYL BETAINE･OLEA EUROPAEA (OLIVE) LEAF EXTRACT･CRATAEGUS MONOGYNA FLOWER EXTRACT･LAMIUM ALBUM FLOWER/LEAF/STEM EXTRACT･MORUS ALBA ROOT EXTRACT･CAFFEINE･RUBUS SUAVISSIMUS (RASPBERRY) LEAF EXTRACT･CAMELLIA SINENSIS LEAF EXTRACT･SODIUM ACETYLATED HYALURONATE･SODIUM HYALURONATE･INOSITOL･ORYZA SATIVA (RICE) GERM OIL･PINUS SYLVESTRIS CONE EXTRACT･RUBUS IDAEUS (RASPBERRY) FRUIT EXTRACT･LECITHIN･CINNAMOMUM CASSIA BARK EXTRACT･TOCOPHEROL･ALPINIA SPECIOSA LEAF EXTRACT･ZINGIBER OFFICINALE (GINGER) RHIZOME EXTRACT･SOLUBLE COLLAGEN･HYDROLYZED ELASTIN･UNCARIA GAMBIR EXTRACT･COIX LACRYMA-JOBI MA-YUEN SEED EXTRACT･SANGUISORBA OFFICINALIS ROOT EXTRACT･SODIUM BENZOATE･BUPLEURUM FALCATUM ROOT EXTRACT･
Key Ingredients
Exclusive Purifying Beautifier with mulberry and cinnamon bark extracts, Retinol ACE, 4MSK & Vitamin C-Ethyl, Vitamin E, Double Hyaluronic Acid
Ingredients Details
Behenyl Alcohol
Common Name(s): Behenyl alcohol,inci ingredient,cosmetic active
CAS Number: N/a
DESCRIPTION
What It Does: Provides documented cosmetic activity from behenyl alcohol.
Why It's Used: Behenyl alcohol delivers formulation value through its specific biological activity and established safety and efficacy.
How It Works: Source: behenyl alcohol. mechanism: documented in cosmetic literature. safety: cosing-reviewed. standard cosmetic use concentrations.
Typically Found In: Skin care formulations,active products
TECHNICAL DETAILS
Primary Category: Active ingredient – antioxidant
Secondary Functions: Free radical scavenging,anti-aging
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: 0.1%–5%
SOURCING & ETHICS
Vegan Status: Conditional
Halal Status: Yes
Source Notes: Plant-derived extract or synthetic.
SKIN COMPATIBILITY
Irritancy Rating: 1/5 – very low
Comedogenicity Rating: 0/5 – non-comedogenic
Sensitivity Concerns: Non-irritating; well-tolerated.
Safe for Sensitive Skin: Yes
SAFETY & COMPATIBILITY
Safety Profile: Excellent safety profile. ewg score: 1.
Works Well With: Vitamin c,vitamin e,ferulic acid,spf,other antioxidants
Avoid Combining With: No significant incompatibilities
SCIENTIFIC NOTE
Behenyl alcohol provides cosmetic activity through its characteristic mechanism. at standard concentrations it delivers documented biological activity with an established safety profile from cosmetic science literature and regulatory review.
Last Verified: Cosing database,behenyl alcohol technical literature
Primary Sources: 2026-03-12
Butylene Glycol
Common Name(s): 1,3-butanediol,bg,1,3-butylene glycol
CAS Number: 107-88-0
DESCRIPTION
What It Does: Provides humectant hydration and active ingredient solubilization with excellent skin feel.
Why It's Used: Preferred glycol humectant in premium and k-beauty formulations for superior skin feel vs propylene glycol with equivalent functionality.
How It Works: Two hydroxyl groups at 1,3-positions provide water binding and solvent activity. better tolerated than propylene glycol with minimal sensitization risk. 4-carbon backbone provides slightly greater hydrophobic character enabling dissolution of less polar actives vs pg.
Typically Found In: Toners,essences,serums,k-beauty formulas
TECHNICAL DETAILS
Primary Category: Functional ingredient – glycol humectant
Secondary Functions: Tewl reduction,skin plumping
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: 1%–10%
SOURCING & ETHICS
Vegan Status: Yes – synthetic
Halal Status: Yes
Source Notes: Synthetic or naturally derived. excellent aqueous solubility.
SKIN COMPATIBILITY
Irritancy Rating: 1/5 – very low
Comedogenicity Rating: 0/5 – non-comedogenic
Sensitivity Concerns: Non-irritating; suitable for all skin types.
Safe for Sensitive Skin: Yes
SAFETY & COMPATIBILITY
Safety Profile: Excellent safety profile. ewg score: 1.
Works Well With: Ceramides,emollients,occlusives,glycerin,hyaluronic acid
Avoid Combining With: No significant incompatibilities
SCIENTIFIC NOTE
K-beauty's preference for butylene glycol over propylene glycol is driven by two factors: bg's superior skin feel (less tacky than pg's higher viscosity) and its lower sensitization potential (1,3-bg has better spatial distribution of hydroxyl groups that reduces protein interaction vs pg's 1,2-position oh groups).
Last Verified: Cosing database,cir safety assessment
Primary Sources: 2026-03-12
Dimethicone
Common Name(s): Pdms,polydimethylsiloxane,silicone fluid
CAS Number: 9006-65-9
DESCRIPTION
What It Does: Provides silicone-characteristic silky feel and skin protection with adjustable viscosity.
Why It's Used: The benchmark cosmetic silicone – sets the gold standard for silky application feel, spreadability, and skin protection in virtually all skin care categories.
How It Works: Polydimethylsiloxane chain flexibility provides extremely low surface tension and high spreadability. inert si-o backbone provides chemical stability and excellent skin tolerance. occlusive film formation reduces tewl. higher viscosity grades provide more intense conditioning.
Typically Found In: Moisturizers,foundations,primers,sunscreens – nearly universal
TECHNICAL DETAILS
Primary Category: Functional ingredient – polydimethylsiloxane
Secondary Functions: Barrier sealing,softening
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: 0.1%–30%
SOURCING & ETHICS
Vegan Status: Yes – synthetic
Halal Status: Yes
Source Notes: Plant-derived, synthetic or animal-derived. verify source.
SKIN COMPATIBILITY
Irritancy Rating: 1/5 – very low
Comedogenicity Rating: 1/5 – low; formulation-dependent
Sensitivity Concerns: Non-irritating.
Safe for Sensitive Skin: Yes
SAFETY & COMPATIBILITY
Safety Profile: Excellent safety profile. ewg score: 1.
Works Well With: Humectants,ceramides,actives as carrier
Avoid Combining With: No significant incompatibilities
SCIENTIFIC NOTE
Dimethicone's exceptional silky feel arises from its very low intermolecular attractive forces (weak van der waals forces due to non-polar methyl groups) that allow silicone chains to slide freely over skin. the coefficient of kinetic friction for pdms against skin (~0.04) is among the lowest of any cosmetic material – explaining why even small amounts transform product feel.
Last Verified: Cosing database,cir safety assessment
Primary Sources: 2026-03-12
Diphenylsiloxy Phenyl Trimethicone
Common Name(s): Diphenylsiloxy phenyl trimethicone,phenyl silicone,conditioning silky film-forming
CAS Number: N/a
DESCRIPTION
What It Does: Diphenylsiloxy phenyl trimethicone deposits an ultra-thin, flexible conditioning film on skin and hair that dramatically reduces surface friction, provides water-repellent moisture lock-in, protects hair from heat damage and humidity-induced frizz, and delivers the smooth, silky sensory experience that distinguishes premium personal care from basic functional products.
Why It's Used: Formulators choose diphenylsiloxy phenyl trimethicone for its unique functional profile that organic emollients cannot replicate: the si-o backbone (bond angle 150° vs c-c 109°) provides exceptional molecular flexibility allowing the silicone polymer to flatten along any surface topology, creating an ultra-conforming film. the surface energy of cured silicone (~20 mn/m) is lower than any organic emollient, providing superior lubricity without the heaviness or comedogenic character of equivalent organic oils. for hair specifically, silicone deposition dramatically reduces the coefficient of friction between hair fibres from ~0.8 (uncoated) to ~0.25 (silicone-coated), providing the detangling and smoothing that defines premium conditioner performance.
How It Works: Diphenylsiloxy phenyl trimethicone functions through the si-o siloxane backbone's fundamental physical chemistry: (1) surface deposition — the polymer's backbone flexibility allows it to flatten onto hair and skin surfaces, maximising contact area and van der waals adhesion. the polydimethylsiloxane chain adopts a helical conformation in free solution but extends to near-flat conformation on surfaces, providing maximum coverage per molecule deposited; (2) low surface energy film — the methyl groups surrounding the si-o backbone present an array of non-polar, non-hydrogen-bonding surfaces. the surface energy of ~20 mn/m is lower than water (~72 mn/m) and organic oils (~30–35 mn/m), providing excellent lubricity from the lowest-energy surface; (3) thermal stability — si-o bond energy (105 kcal/mol vs c-c 83 kcal/mol) provides exceptional heat resistance, making dimethicone uniquely suitable as a heat-protectant on hair during blow-drying and flat-ironing up to 230°c; (4) breathability — despite the water-repellent surface, silicone films have sufficient molecular-scale porosity to allow oxygen, co₂, and water vapour transmission from the film's non-crystalline, flexible structure — unlike occlusive waxes that form dense impermeable films.
Typically Found In: Hair conditioners,skin care emollients,heat protectants
TECHNICAL DETAILS
Primary Category: Functional ingredient – emollient
Secondary Functions: Barrier sealing,softening
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: 0.5%–25%
SOURCING & ETHICS
Vegan Status: Yes
Halal Status: Yes
Source Notes: Plant-derived, synthetic or animal-derived. verify source.
SKIN COMPATIBILITY
Irritancy Rating: 1/5 – very low
Comedogenicity Rating: 1/5 – low; formulation-dependent
Sensitivity Concerns: Non-irritating.
Safe for Sensitive Skin: Yes
SAFETY & COMPATIBILITY
Safety Profile: Excellent safety profile. ewg score: 1.
Works Well With: Humectants,ceramides,actives as carrier
Avoid Combining With: No significant incompatibilities
SCIENTIFIC NOTE
Si-o backbone flexibility vs organic polymers: c-c bond angle is fixed at 109.5° (tetrahedral sp3) with restricted rotation, giving organic polymer chains a preferred helical structure that resists lying flat on surfaces. si-o bond angle is 150° with near-free rotation from the longer si-o bond (1.64 å vs c-c 1.54 å) and lower rotational barrier (~0.6 kcal/mol vs c-c ~3 kcal/mol). this 5× lower rotational barrier allows silicone chains to adopt virtually any conformation essentially free of energy cost — enabling the flat, conforming surface adsorption that provides optimal thin-film coverage and explains the silky-smooth feel unobtainable from rigid organic polymer films.
Last Verified: Cosing database,diphenylsiloxy phenyl trimethicone silicone film conditioning review
Primary Sources: 2026-03-12