1st on the list, which puts it at an estimated 30–80% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
COSRX
The 6 Peptide Skin Booster Serum
face serum
COSRX
face serum
Added Last edited
Fit by skin type
General, ingredient-based — not your personalized match.
See how this fits your skin
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Take the skin testExperience the transformative power of COSRX The 6 Peptide Skin Booster Serum, a multi-functional serum designed to enhance your skin's overall condition. Infused with a powerful 6 Peptide Complex, this serum boosts skin elasticity, refines texture, and provides effective pore care. The lightweight, non-sticky formula absorbs quickly, delivering niacinamide to brighten dull skin, and hyaluronic acid and allantoin to deeply moisturize. Ideal as the first step in your skincare routine, it smooths fine lines, evens skin tone, and controls sebum for a soft, radiant complexion.
The 6 Peptide Skin Booster Serum is a lightweight serum from COSRX, a brand based in Korea. The formula is built mainly around hydration. The ingredient list runs to 44 ingredients, each broken down in full below.
By its ingredient list the formula reads as light: water and humectants lead, with emollients kept lower in the order. Hydration is handled by Glycerin, Butylene Glycol and Ethylhexylglycerin, humectants that pull water into the upper layers of skin rather than sealing it there.
Hydration: Very high. Ingredients that pull and hold water in the upper layers of skin, and here that comes from Glycerin, Butylene Glycol, Ethylhexylglycerin and Betaine.
Soothing: Moderate. Ingredients aimed at visible redness and reactivity, and here that comes from Allantoin, Niacinamide, Adenosine and Sodium PCA.
Brightening: Moderate. Ingredients that act on uneven tone and post-inflammatory marks, and here that comes from Niacinamide, Acetyl Glucosamine and Tocopherol.
Firmness signalling: Moderate. Peptides and growth factors that signal for collagen support, and here that comes from Adenosine, Acetyl Hexapeptide-8, Copper Tripeptide-1 and Sh-polypeptide-1.
On richness alone it suits Balanced, Combination (oily) and Oily skin best, and is the least natural fit for Dry and Combination (dry) skin. Nothing in the list is flagged as a common irritant, which is a reasonable starting point for reactive skin — though a patch test is still the only way to know.
The formula contributes little or nothing on antioxidant protection and cell renewal. That is not a fault — most products are not meant to do everything — but if one of those is your priority, this is not the product that will address it.
Reading the full list, the formula is fragrance-free, essential-oil-free, no drying alcohol, paraben-free, silicone-free and microplastic-free. Those claims come from the ingredient list itself, not from the packaging.
It can be used morning and evening. In a routine it goes after toner, before moisturiser. Apply to clean, dry skin and give it a minute to absorb before the next layer. Introduce one new treatment at a time so you can identify what is working.
This summary is generated from the product's ingredient list. It is not a review, it is not the brand's own marketing claims, and it does not replace advice from a dermatologist.
Drawn purely from the ingredient list
Scored on how rich or light the formula reads from its INCI order.
No ingredient in this formula carries a common-irritant flag, making it a reasonable option for reactive skin. A patch test is still recommended, as individual skin reactivity varies.
Based on the curated benefits documented for this product's ingredients.
Attracts and locks in moisture to keep skin plump and dewy
Boosts collagen and cell turnover to reduce fine lines and wrinkles
Calms redness, irritation, and inflammation for sensitive skin
Brightens and balances complexion for a more uniform appearance
Tightens and refines the look of enlarged pores
None of the ingredients in this formula are associated with these benefits. This is not unusual, as most products are designed to target a limited number of concerns.
The actives, UV filters and benefit-carrying ingredients in this formula, in the order they are listed.
1st on the list, which puts it at an estimated 30–80% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
3rd on the list, which puts it at an estimated 5–20% of the formula.
Glycerine ;Glycerol (INN); Glycerol (RIFM); Glycerolum (EP); Glycyl Alcohol; 1,2,3-Propanetriol; 1,2,3-Trihydroxypropane
4th on the list, which puts it at an estimated 2–10% of the formula.
1,2-Dihydroxypentane
6th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Niacinamide (vitamin B3) is a gentle skincare active that repairs the skin barrier, calms redness, controls oil and evens tone at 2–5%. Official IUPAC name: **3-Pyridinecarboxamide**
7th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Ammonium Acryloyldimethyltaurate/VP Copolymer is a copolymer of ammonium acryloyldimethyltaurate and vinylpyrrolidone monomers
9th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Butane-1,3-diol (CAS No. 107-88-0/ EC No. 203-529-7) (R)-(-)-butane-1,3-diol” (CAS No. 6290-03-5/ EC No. 228-532-0)
11th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,2-Propanediol, 3-(2-ethylhexyloxy)
12th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
6-Amino-9-beta-D-ribofuranosyl-9H-purine
13th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2-(N,N,N-Trimethylamino)ethyl 2-(2-methyl-2-propenoyloxy)ethyl phosphate inner salt, polymer with butyl 2-methyl-2-propenoate
15th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2-Hydroxy-1,2,3-propanetricarboxylic acid
17th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Methanaminium, 1-carboxy-N,N,N-trimethyl-, hydroxide, inner salt
19th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Sodium 5-oxo-2-pyrrolidinecarboxylate
Each axis is scored from the ingredients present and how high up the list they sit.
Ingredients that pull and hold water in the upper layers of skin
Lipids and repair signals that support skin barrier integrity
Ingredients that mop up free radicals from UV and pollution
Ingredients that moderate sebum or absorb shine
Ingredients that act on uneven tone and post-inflammatory marks
Ingredients aimed at visible redness and reactivity
Retinoids, acids and enzymes that speed surface turnover
Peptides and growth factors that signal for collagen support
"Active" here means an ingredient carrying a recorded active type or a recognised UV filter.
Solvents, emollients, texture agents and preservatives — the formula that carries the actives.
Read from the full ingredient list. A brand's own claim may differ.
Judged by the same curated rules our routine checker uses. It reads the ingredients, not the label.
Best kept to separate routines — one in the morning, one at night, or on alternate days.
This product is the "Treat" step.
Flags to check, not verdicts. None of this is medical advice — if you are pregnant, breastfeeding or treating a skin condition, ask a doctor.
Most ingredients do more than one job, so these counts add up to more than the 44 ingredients on the label.
Sets the thickness, spread and stability of the formula
Draws water into the upper layers of skin
Changes how skin behaves rather than how it feels
Dissolves and carries everything else
Amino-acid chains that signal for repair or firmness
Forms a film that slows water loss
Sets the acidity the formula needs to work
Lifts oil and dirt, or holds oil and water together
Softens and smooths by filling gaps between skin cells
Binds trace metals that would otherwise spoil the formula
Neutralises free radicals from UV and pollution
Calms visible redness and irritation
Loosens or dissolves dead surface cells
Keeps the product free of microbial growth
Every ingredient on the label, in order, with what it does and roughly how much of it is likely to be there.
1st on the list, which puts it at an estimated 30–80% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
2nd on the list, which puts it at an estimated 5–20% of the formula.
1,1'-Oxydipropan-2-ol; Oxydipropan-2-ol; Hydroxypropyloxypropanol
3rd on the list, which puts it at an estimated 5–20% of the formula.
Glycerine ;Glycerol (INN); Glycerol (RIFM); Glycerolum (EP); Glycyl Alcohol; 1,2,3-Propanetriol; 1,2,3-Trihydroxypropane
4th on the list, which puts it at an estimated 2–10% of the formula.
1,2-Dihydroxypentane
5th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
6th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Niacinamide (vitamin B3) is a gentle skincare active that repairs the skin barrier, calms redness, controls oil and evens tone at 2–5%. Official IUPAC name: **3-Pyridinecarboxamide**
7th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Ammonium Acryloyldimethyltaurate/VP Copolymer is a copolymer of ammonium acryloyldimethyltaurate and vinylpyrrolidone monomers
8th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Polyacrylate Crosspolymer-6 is a copolymer of ammonium acryloyldimethyltaurate, dimethylacrylamide, lauryl methacrylate and laureth-4 methacrylate, crosslinked with trimethylolpropane triacrylate
9th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Butane-1,3-diol (CAS No. 107-88-0/ EC No. 203-529-7) (R)-(-)-butane-1,3-diol” (CAS No. 6290-03-5/ EC No. 228-532-0)
10th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Xanthan gum
11th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,2-Propanediol, 3-(2-ethylhexyloxy)
12th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
6-Amino-9-beta-D-ribofuranosyl-9H-purine
13th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2-(N,N,N-Trimethylamino)ethyl 2-(2-methyl-2-propenoyloxy)ethyl phosphate inner salt, polymer with butyl 2-methyl-2-propenoate
14th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Disodium dihydrogen ethylenediaminetetraacetate
15th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2-Hydroxy-1,2,3-propanetricarboxylic acid
16th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Octane-1,2-diol
17th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Methanaminium, 1-carboxy-N,N,N-trimethyl-, hydroxide, inner salt
18th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2-Methylpropan-2-ol
19th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Sodium 5-oxo-2-pyrrolidinecarboxylate
20th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Sodium lactate
21st on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Acetyl hexapeptide-8 is the synthetic peptide consisting of arginine, methionine, and acetylated glutamic acid residues
22nd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Copper Tripeptide-1 is a copper complex of Tripeptide-1
23rd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
L-2-Pyrrolidone-5-carboxylic acid
24th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
sh-Polypeptide-1 is a single chain synthetic human peptide, produced by fermentation in E. coli. The starting gene is a synthesized copy of the human gene which codes for Basic Fibroblast Growth Factor used as such or adapted to the production host. It contains a maximum of 288 amino acids which may contain disulfide bonds and/or glycosylation. The protein consists of the proper sequence of the 20 standard amino acids.
25th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2-Amino-3-hydroxypropanoic acid
26th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Alanine
27th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Urea, (2,5-dioxo-4-imidazolidinyl)-
28th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Hyaluronic acid, sodium, salt
29th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
N-acetyl-.alpha.-D-glucosamine
30th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Glycine
31st on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
(S)-2-Aminopentanedioic acid
32nd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
33rd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2-Amino-3-hydroxybutanoic acid
34th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
35th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
L-Arginine
36th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
3,4-Dihydro-2,5,7,8-tetramethyl-2-(4,8,12-trimethyltridecyl)-2H-benzopyran-6-ol; .alpha.-tocopherol; Vitamin E
37th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Oligopeptide-68 is the synthetic peptide containing 12 amino acids consisting of arginine, aspartic acid, glycine, glutamine, isoleucine, leucine, serine, threonine, tryptophan and tyrosine
38th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2-Pyrrolidinecarboxylic acid, (S)-
39th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Dextran
40th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Palmitoyl Tripeptide-8 is the product obtained by the reaction of palmitic acid and Tripeptide-8
41st on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Glycine Soja Oil is the oil obtained from the soybean, Glycine soja, Leguminosae, by extraction or expression. It consists esentially of triglycerides of oleic, linoleic and saturated acids
42nd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Lecithins, hydrogenated
43rd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Potassium (E,E)-hexa-2,4-dienoate
44th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Sodium oleate
Products in the same category that share this formula's distinguishing ingredients.
Arencia
Shares 12 key ingredients with The 6 Peptide Skin Booster Serum: Water, Butylene Glycol, Glycerin, Niacinamide, Sodium Hyaluronate
SKIN1004
Shares 12 key ingredients with The 6 Peptide Skin Booster Serum: Water, Glycerin, Niacinamide, Sodium Hyaluronate, Butylene Glycol
Anua
Shares 12 key ingredients with The 6 Peptide Skin Booster Serum: Water, Niacinamide, Glycerin, Ammonium Acryloyldimethyltaurate/vp Copolymer, Butylene Glycol
COSRX
Shares 11 key ingredients with The 6 Peptide Skin Booster Serum: Water, Butylene Glycol, Pentylene Glycol, Glycerin, Niacinamide
Eqqualberry
Shares 11 key ingredients with The 6 Peptide Skin Booster Serum: Water, Butylene Glycol, Glycerin, Niacinamide, Betaine
Arencia
Shares 11 key ingredients with The 6 Peptide Skin Booster Serum: Water, Glycerin, Sodium Hyaluronate, Niacinamide, Pentylene Glycol
WATER, DIPROPYLENE GLYCOL, GLYCERIN, PENTYLENE GLYCOL, 1,2-HEXANEDIOL, NIACINAMIDE, AMMONIUM ACRYLOYLDIMETHYLTAURATE/VP COPOLYMER, POLYACRYLATE CROSSPOLYMER-6, BUTYLENE GLYCOL, XANTHAN GUM, ETHYLHEXYLGLYCERIN, ADENOSINE, POLYQUATERNIUM-51, DISODIUM EDTA, CITRIC ACID, CAPRYLYL GLYCOL, BETAINE, T-BUTYL ALCOHOL, SODIUM PCA, SODIUM LACTATE, ACETYL HEXAPEPTIDE-8, COPPER TRIPEPTIDE-1, PCA, SH-POLYPEPTIDE-1, SERINE, ALANINE, ALLANTOIN, SODIUM HYALURONATE, ACETYL GLUCOSAMINE, GLYCINE, GLUTAMIC ACID, LYSINE HCL, THREONINE, DIPEPTIDE DIAMINOBUTYROYL BENZYLAMIDE DIACETATE, ARGININE, TOCOPHEROL, OLIGOPEPTIDE-68, PROLINE, DEXTRAN, PALMITOYL TRIPEPTIDE-8, GLYCINE SOJA OIL, HYDROGENATED LECITHIN, POTASSIUM SORBATE, SODIUM OLEATE.
NIACINAMIDE, CITRIC ACID, ACETYL HEXAPEPTIDE-8, COPPER TRIPEPTIDE-1, SH-POLYPEPTIDE-1, SODIUM HYALURONATE, DIPEPTIDE DIAMINOBUTYROYL BENZYLAMIDE DIACETATE, PALMITOYL TRIPEPTIDE-8.
After cleansing, you may use this serum as the first step of skin care. Spread the serum on the entire face, avoiding the eye and mouth areas. Lightly pat into the skin to aid in absorption. Apply several times to amplify the effect of the next serum or ampoule.
Judged on how rich the formula reads from its ingredient list, it suits Balanced, Combination (oily), Oily skin best. It is the least natural fit for Dry, Combination (dry) skin.
No ingredient in this formula carries a common-irritant flag, making it a reasonable option for reactive skin. A patch test is still recommended, as individual skin reactivity varies.
One ingredient could feed malassezia: Sodium Oleate. That describes the yeast's food supply, not a prediction that it will cause a breakout.
Nothing in this formula is on the standard pregnancy-caution list. That is not medical clearance — check anything you use daily with your doctor or midwife.
Yes. Reading the full ingredient list, this formula is fragrance-free.
No. Reading the full ingredient list, this formula is no drying alcohol.
Yes. Reading the full ingredient list, this formula is silicone-free.
No. Reading the full ingredient list, this formula is essential-oil-free.
Yes. Reading the full ingredient list, this formula is paraben-free.
It layers well with Vitamin C (L-ascorbic acid), Retinoids (retinol, retinal), AHAs (glycolic, lactic), BHA (salicylic acid), PHAs (gluconolactone), Azelaic acid. Take more care combining it with Benzoyl peroxide — use them in separate routines or on alternate days.
Use it morning and evening, after toner, before moisturiser.
It lists 44 ingredients, of which 8 are recorded as actives.
COSRX, a brand based in Korea.
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