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COSRX The 6 Peptide Skin Booster Serum revitalises and firms the skin with a potent blend of six peptides, promoting a youthful and radiant complexion. This lightweight serum is designed to target signs of ageing, such as fine lines and wrinkles, while improving skin elasticity and texture.
Suitable for all skin types, COSRX The 6 Peptide Skin Booster Serum combines six powerful peptides to enhance collagen production and support skin's natural repair processes. The formula hydrates deeply, leaving the skin feeling smooth, plump, and rejuvenated. Fast-absorbing and non-greasy, it provides an instant boost of radiance and long-term anti-ageing benefits.
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Directions
How To Use COSRX The 6 Peptide Skin Booster Serum
After cleansing your skin, apply an adequate amount of product, gently patting for better absorption.
Ingredients
COSRX The 6 Peptide Skin Booster Serum Ingredients
The water base that carries and dissolves the other ingredients in most products.
May suit
All hair and skin types.
Worth knowing
Almost always the first ingredient listed in water-based products.
Dipropylene GlycolHumectants
Humectant
A versatile humectant that helps attract and hold moisture while improving product texture and spreadability.
May suit
Those looking for products that support moisture balance without heaviness.
Worth knowing
It is also commonly used as a solvent to help dissolve other ingredients evenly in a formula. It is well tolerated in most haircare products and contributes to a smooth application feel.
GlycerinHumectants
Humectant
Attracts and holds water to help hair feel hydrated and soft.
May suit
Dry or dehydrated hair, and many curl and moisture routines.
Worth knowing
A very common, well-tolerated humectant used across countless products.
Pentylene GlycolHumectants
Humectant and solvent
Helps attract and hold moisture while also improving the spreadability of a formula.
May suit
Those seeking lightweight hydration without heaviness.
Worth knowing
It also supports product texture and can enhance the performance of other ingredients in a formula.
2-HexanediolSolvents
Solvent and humectant
Helps dissolve other ingredients and provides light moisture to haircare formulas.
May suit
Those interested in lightweight, non-greasy formulas that spread easily.
Worth knowing
It is also used as a preservative booster to support formula stability.
NiacinamideAnti-dandruff / scalp care
Scalp-supporting vitamin
Niacinamide is a form of vitamin B3 that helps support a balanced scalp environment and improve hair resilience.
May suit
Those looking to support scalp comfort, strengthen hair, or maintain a healthy-looking scalp barrier.
Worth knowing
It is commonly used in both skincare and haircare for its soothing and barrier-supporting properties. It pairs well with many other ingredients and is generally well tolerated.
Acetyl Hexapeptide-8Proteins and amino acids
Peptide conditioning agent
A short-chain peptide used to help condition hair and support a smoother feel.
May suit
Those looking for advanced conditioning or scalp-care formulations.
Worth knowing
Peptides are used in some haircare products to support softness and manageability. They are included at low levels to complement other conditioning agents.
Dipeptide Diaminobutyroyl Benzylamide DiacetateProteins and amino acids
Peptide active
A small synthetic peptide used as a cosmetic active that is marketed to reduce micro‑contractions in skin and promote a smoother appearance.
May suit
People looking for smoothing or anti‑ageing effects in leave‑on scalp or skin treatments, and formulators seeking a neuromodulator‑like peptide active.
Worth knowing
This ingredient is a lab‑made peptide inspired by a naturally occurring peptide and is used at low concentrations in leave‑on products. Clinical evidence is limited and most studies target skin appearance rather than specific hair benefits.
Good to know
Dipeptide Diaminobutyroyl Benzylamide Diacetate (often sold under the trade name Syn‑Ake) is designed to mimic the effect of certain bioactive peptides by modulating neuromuscular signalling involved in fine muscle contractions; in cosmetics it aims to reduce the appearance of fine lines and create a smoother surface. It is typically incorporated into serums, creams and some scalp treatments as an active ingredient; sensitivity is uncommon but patch testing is standard for new actives. Efficacy depends on formulation, concentration and consistent use, and most published data relate to facial skin rather than hair or scalp.
AllantoinConditioning agents
Scalp‑soothing conditioner
Allantoin helps soothe the scalp and condition the hair and skin.
May suit
Those with a sensitive or easily irritated scalp may appreciate its calming effect.
Worth knowing
It is widely used in personal care for its comforting feel and compatibility with many formulas. In haircare, it supports a smoother, more comfortable scalp experience.
Sodium HyaluronateHumectants
Hydrating humectant
Draws moisture into the hair and helps maintain hydration.
May suit
Those with dry, dehydrated or coarse hair seeking added softness and moisture retention.
Worth knowing
It is the salt form of hyaluronic acid and is widely used because it can hold many times its weight in water. In haircare, it helps support smoother, more manageable strands without adding heaviness.
Acetyl GlucosamineHumectants
Hydrating humectant
Helps attract and retain moisture to support softer, smoother-feeling hair.
May suit
Those seeking hydration, improved softness or enhanced manageability.
Worth knowing
It is a derivative of glucosamine often used in skincare and can also support moisture balance in hair products.
SerineProteins and amino acids
Amino acid conditioner
Serine is an amino acid used to support moisture balance and improve the feel of hair.
May suit
Those seeking lightweight hydration or formulas that help smooth and soften hair.
Worth knowing
Amino acids like serine are often included in conditioning or strengthening blends to complement other hair-hydrating ingredients. They can be used in many types of haircare from shampoos to treatments.
AlanineProteins and amino acids
Amino acid conditioner
Alanine is an amino acid used to help condition and support hair feel and manageability.
May suit
People looking for gentle conditioning ingredients or formulas designed to support softness without heaviness.
Worth knowing
Amino acids like alanine are often included in haircare to complement protein or moisture-focused formulas. They can contribute to a smooth, hydrated feel.
GlycineProteins and amino acids
Amino acid
An amino acid that helps support hair softness and overall hair fibre condition.
May suit
Those looking to improve hair manageability or support moisture balance.
Worth knowing
Glycine is often included as part of amino acid blends used to condition and reinforce the hair fibre. It can also appear in gentle cleansing systems and care-focused formulations.
ThreonineProteins and amino acids
Amino acid
Threonine is an amino acid used to support hair conditioning and strength.
May suit
Those looking for formulas that help maintain softness and support the hair’s protein structure.
Worth knowing
Amino acids are often included in haircare to help improve the feel and manageability of the hair fibre. They can complement other conditioning and strengthening ingredients in a formula.
ArginineProteins and amino acids
Amino acid
An amino acid used to support hair strength and maintain moisture balance.
May suit
Those looking for formulas that help with hair resilience or hydration.
Worth knowing
Arginine is naturally present in the hair’s keratin structure and is commonly added to strengthening or repairing products. It is also used in some formulations to help support scalp comfort.
ProlineProteins and amino acids
Amino acid conditioner
An amino acid that helps support hair feel, softness and overall conditioning.
May suit
Those looking for formulas that help improve hair manageability or support lightly replenishing treatments.
Worth knowing
Amino acids like proline are often included in small amounts to complement conditioning systems and support the hair’s natural protein structure.
BetaineConditioning agents
Conditioning agent
Helps condition and hydrate hair by supporting moisture balance.
May suit
Those looking for softer, smoother-feeling hair or gentle hydration.
Worth knowing
Betaine is a naturally occurring molecule often used to improve hair feel and support moisture retention. It can also help enhance the overall mildness of cleansing formulas.
Sodium PCAHumectants
Moisture-binding humectant
Sodium PCA helps attract and hold moisture in the hair and scalp.
May suit
Those looking to improve hair hydration, softness, or manageability.
Worth knowing
It is a component of the skin and scalp’s natural moisturising factors and is well tolerated in most formulations.
Sodium LactateHumectants
Moisture-binding humectant
Helps attract and hold moisture in the hair and scalp.
May suit
Those seeking added hydration, improved manageability, or support for dry scalp.
Worth knowing
It is a salt of lactic acid often used to enhance moisture retention and support a balanced formula. It can also contribute mild pH-buffering benefits depending on the product.
Pyrrolidone Carboxylic AcidHumectants
Moisture-binding humectant
A humectant that helps attract and hold moisture in the hair and scalp.
May suit
Those with dry or dehydrated hair seeking improved softness and manageability.
Worth knowing
PCA is related to naturally occurring moisturising factors found in skin and hair. It is often used alongside other humectants for balanced hydration.
Glutamic AcidProteins and amino acids
Amino acid conditioning agent
An amino acid used to help condition hair and support moisture balance.
May suit
People looking for formulas that help smooth and soften hair without heaviness.
Worth knowing
Amino acids like glutamic acid can support the hair’s natural structure and improve the feel of conditioners and treatments. They are commonly used in both rinse-off and leave-in products.
Lysine HydrochlorideProteins and amino acids
Amino acid
An amino acid used to support hair strength and moisture balance.
May suit
Those looking for formulas that help maintain hair resilience or support overall conditioning.
Worth knowing
Amino acids like lysine are often included in haircare to complement protein-based or strengthening formulations. They can contribute to a smoother, more conditioned feel.
TocopherolPreservatives
Antioxidant
An antioxidant that helps support product stability and can provide conditioning benefits to hair.
May suit
Those wanting added nourishment or antioxidant support in their haircare routine.
Worth knowing
Tocopherol is commonly included to help protect oils in a formula from oxidising and to offer light conditioning benefits. It is widely used in both skincare and haircare products.
DextranThickeners and stabilisers
Stabiliser and texture enhancer
A polysaccharide used to help stabilise formulas and improve product texture.
May suit
Those who prefer products with a smoother, more uniform feel.
Worth knowing
Dextran can also support the performance of other ingredients by helping maintain an even consistency. It is commonly used in both skincare and haircare for its gentle, supportive role in formulations.
Glycine Soja (Soybean) OilOils and butters
Emollient oil
A plant-derived oil that helps soften and condition the hair.
May suit
Those looking for added softness, shine, or nourishment in dry or coarse hair.
Worth knowing
It is commonly used as a lightweight conditioning oil in many haircare formulas. It can also support the spreadability of styling and treatment products.
Hydrogenated LecithinConditioning agents
Emollient and conditioning agent
Helps condition the hair and support smooth, stable formulations.
May suit
People looking for products that enhance softness and manageability.
Worth knowing
It is a hydrogenated form of lecithin that can improve texture and support the delivery of other ingredients. Commonly used in both skincare and haircare for its smoothing feel.
Ammonium Acryloyldimethyltaurate/VP CopolymerThickeners and stabilisers
Texture enhancer
A polymer that helps thicken and stabilise haircare formulas for a smooth, consistent texture.
May suit
Those who prefer products with a lightweight, non-greasy feel that still provide good spreadability.
Worth knowing
It is commonly used in modern formulations because it helps create stable gels and creams without adding heaviness. It also contributes to a more uniform application of styling or care products.
Polyacrylate Crosspolymer-6Thickeners and stabilisers
Thickener and stabiliser
Helps thicken and stabilise haircare formulas for a smooth, consistent texture.
May suit
Those who prefer products with a gel-like or uniform texture.
Worth knowing
It is commonly used in gels, creams and styling products to improve spreadability and performance. It also helps keep formulas stable across different temperatures.
Butylene GlycolHumectants
Humectant and solvent
Butylene Glycol helps attract and hold moisture while improving the spreadability of hair products.
May suit
Those looking for hydrated, smoother-feeling hair or lighter-feeling formulations.
Worth knowing
It is commonly used to help ingredients dissolve and to give formulas a soft, glide-on texture. It appears in many leave-in and rinse-off products due to its versatility.
Xanthan GumThickeners and stabilisers
Thickener and stabiliser
Xanthan Gum helps thicken and stabilise haircare formulas for a smooth, consistent texture.
May suit
People who prefer products with a richer or more gel-like texture.
Worth knowing
It is a polysaccharide widely used in cosmetics to keep formulas uniform and easy to apply. It works well alongside many other common ingredients.
EthylhexylglycerinPreservatives
Preservative booster
Helps support the preservation system and can provide mild skin-conditioning benefits.
May suit
Those interested in gentle preservation systems or sensitive scalps may find it relevant.
Worth knowing
It is often paired with other preservatives to improve their effectiveness while allowing for lower usage levels. It also has light moisturising and conditioning properties.
AdenosineAnti-dandruff / scalp care
Scalp care ingredient
Adenosine is used in hair and scalp products to help support a healthy scalp environment.
May suit
People looking for scalp‑care formulas or products aimed at supporting fuller‑looking hair.
Worth knowing
It is often included in leave‑on treatments where it can sit on the scalp for longer contact time. Research has explored its role in supporting the appearance of thicker, denser hair.
Polyquaternium-51Conditioning agents
Film-forming conditioner
A conditioning polymer that forms a light film to help smooth and hydrate hair.
May suit
Those looking to improve softness, manageability and moisture retention, especially in dry or damaged hair.
Worth knowing
It is known for its humectant-like and conditioning properties, helping hair feel smoother without adding heaviness. Often used to enhance slip and reduce static.
Disodium EDTAChelating agents
Chelating agent
Binds to minerals from hard water so the product works consistently and stays stable.
May suit
All products, especially in hard-water areas.
Worth knowing
Used in tiny amounts to keep formulas performing reliably.
Citric AcidpH adjusters
pH adjuster
Fine-tunes the product pH, which can help the hair surface feel smooth.
May suit
Most hair types as part of a balanced formula.
Worth knowing
Usually present in small amounts to balance the formula.
Caprylyl GlycolHumectants
Humectant
Helps attract and hold moisture in hair and scalp while supporting product stability.
May suit
Those looking for added hydration or smoother-feeling hair.
Worth knowing
It is also commonly used as a preservative booster to help maintain formula freshness. It is well tolerated in most haircare products.
Potassium SorbatePreservatives
Preservative
Helps keep haircare formulas stable by preventing the growth of microbes.
May suit
Anyone who uses water-based products that benefit from reliable preservation.
Worth knowing
It is commonly used alongside other preservation systems to maintain product freshness and extend shelf life. It is generally well tolerated in rinse-off and leave-in products.
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Questions and Answers
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