No ingredient in this formula is flagged in our pregnancy database. That is not medical advice — ask your doctor about anything you are unsure of.
Declared fragrance allergens: HEXYL CINNAMAL, LIMONENE, CITRONELLOL, LINALOOL, BENZYL BENZOATE.
COSRX
Peptide-132 Ultra Perfect Hair Bonding Oil Serum
hair serum
COSRX
Peptide-132 Ultra Perfect Hair Bonding Oil Serum
hair serum
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25
Ingredients
4
Benefits
0
Actives
The COSRX Peptide-132 Ultra Perfect Hair Bonding Oil Serum is a lightweight, high-performance hair serum designed to strengthen and repair damaged hair. Infused with the brand's patented PEPTIDE-132™, it helps to reinforce keratin bonds, providing enhanced strength and resilience. The formula also includes a blend of 7 plant-based oils and Vitamin E, which work together to nourish the hair, reduce frizz, and impart a glossy shine without leaving a greasy residue. Its feather-light texture absorbs quickly, making it suitable for all hair types, especially those with coarse or damaged strands.
Key Insights
Haircare
6
Contains emollients
Contains oils
Contains silicones
Nourishing
Rich
Sulfate-free
Risks
2
Allergen
Silicone
Full Ingredients
25 total
WATER
DIMETHICONE
Silicone
HYDROGENATED POLY(C6-14 OLEFIN)
CETYL ETHYLHEXANOATE
Emollient
DICAPRYLYL CARBONATE
Emollient
DIMETHICONOL
Silicone
DISILOXANE
Silicone
DICAPRYLYL ETHER
Emollient
AMINOPROPYL DIMETHICONE
Silicone
ARGANIA SPINOSA KERNEL OIL
Oil
HEXYLDECANOL
OSMANTHUS FRAGRANS LEAF EXTRACT
HEXYL CINNAMAL
LIMONENE
CITRONELLOL
TOCOPHEROL
LINALOOL
BENZYL BENZOATE
OLEA EUROPAEA FRUIT OIL
Oil
CAMELLIA JAPONICA SEED OIL
Oil
SIMMONDSIA CHINENSIS SEED OIL
Oil
ORYZA SATIVA BRAN OIL
Oil
VITIS VINIFERA SEED OIL
Oil
MACADAMIA TERNIFOLIA SEED OIL
Oil
COPPER TRIPEPTIDE-34 HCL
What this product is
Written from the ingredient list. Where it describes how a formula behaves, that is inferred from what the ingredients are and where they sit in the list, not measured.
Overview
Peptide-132 Ultra Perfect Hair Bonding Oil Serum is a serum from COSRX, aimed at coily hair, curly hair and coarse hair. On the evidence of its ingredient list, the formula works on shine, frizz control and moisture. The ingredients doing most of that work are Dimethicone, Cetyl Ethylhexanoate and Dicaprylyl Carbonate. The list runs to 25 ingredients, 14 of which carry a role we recognise for hair.
How it feels on hair
The oils and film-formers sit high enough in the list that the formula reads as rich — good for coarse, dry or very porous hair, and the kind of thing that can flatten fine hair. It contains Dimethicone, Dimethiconol and Disiloxane. Silicones smooth the cuticle and cut frizz on contact; they are also what a clarifying wash is for, because they do not rinse out with a mild shampoo. The formula leans to moisture rather than protein.
On the scalp
On an oily scalp the richer ingredients here can read as greasy at the roots.
Build-up and porosity
Several ingredients here stay on the hair between washes — Dimethicone, Dimethiconol and Disiloxane — so on low-porosity or fine hair this is a formula that will want a clarifying wash from time to time. For low porosity the formula is on the heavy side — it can sit on top rather than absorb.
Where it goes
It is a treatment step: after shampooing, left on, then rinsed out. Apply a small amount of the serum onto damp or dry hair, focusing on the mid-lengths to ends. Gently distribute the product using your fingers or a comb. Style as usual. For optimal results, use daily to maintain smoothness and shine.
What it is not for
Nothing in this formula is aimed at protein & strength, scalp soothing, oil control and volume / lightweight — not a fault, just the shape of what is in the bottle, and the reason one product rarely covers a whole routine. No ingredient here is one we recognise as supporting hair growth. Reducing breakage and growing hair are different things, and this formula's evidence is for the first.
In short
Working for it
- No sulfate detergents
- Suitable for colour-treated hair
Worth knowing
- Contains silicones that need clarifying
- Prone to building up between washes
- May weigh fine hair down
- Contains fragrance
What it is
Serum
Repairing
Who it suits
Read from the formula's weight, its build-up and its protein — not from a claim on the packaging.
Suits
Coily hair
Curly hair
Coarse hair
Thick hair
Take care with
Fine hair
What it works on
Shine
Frizz control
Moisture
Not what this one is for
Protein & strength
Scalp soothing
Oil control
Volume / lightweight
Curl definition
Color protection
Damage repair
Build-up avoidance
Nothing in this formula is one we recognise as supporting hair growth. Reducing breakage and growing hair are different claims.
Cleansing agents
Sulfate-free.
Silicones
Contains silicones that do not rinse out with a mild shampoo — smoothing, but they need clarifying eventually.
DIMETHICONE
DIMETHICONOL
DISILOXANE
AMINOPROPYL DIMETHICONE
Build-up and weight
Estimated from which ingredients are present and how high they sit in the list, not measured.
Reads as a rich formula.
High build-up potential.
DIMETHICONE
DIMETHICONOL
DISILOXANE
AMINOPROPYL DIMETHICONE
Porosity
Inferred from the formula's weight, humectants and protein.
Low porosity
Take care
Cuticles are tight; moisture penetrates poorly.
Medium porosity
Suits
Cuticles are moderately open; moisture is absorbed well.
High porosity
Suits
Cuticles are open; moisture absorbs fast but is also lost rapidly.
Curly-Girl method
Does not fit the method.
Non-water-soluble silicone
On the scalp
Dry scalp
Take care with
Oily scalp
Where it goes on wash day
- Shampoo
- Conditioner
- Treatment
- Leave-in
- Oil
Composition claims
"Free from" is only claimed when every ingredient on the label resolved to one we know.
No drying alcohol
Paraben-free
Microplastic-free
Sulfate-free
Dye-free
Fragrance
Silicones
Safety
What the formula is made of
One ingredient usually does several jobs, so these counts add up to more than the list length.
14 of 25 ingredients carry a role we recognise for hair.
Oil · 7
Silicone · 4
Emollient · 3
Questions
What ingredients are in Peptide-132 Ultra Perfect Hair Bonding Oil Serum?
WATER, DIMETHICONE, HYDROGENATED POLY(C6-14 OLEFIN), CETYL ETHYLHEXANOATE, DICAPRYLYL CARBONATE, DIMETHICONOL, DISILOXANE, DICAPRYLYL ETHER, AMINOPROPYL DIMETHICONE, ARGANIA SPINOSA KERNEL OIL, HEXYLDECANOL, OSMANTHUS FRAGRANS LEAF EXTRACT, HEXYL CINNAMAL, LIMONENE, CITRONELLOL, TOCOPHEROL, LINALOOL, BENZYL BENZOATE, OLEA EUROPAEA FRUIT OIL, CAMELLIA JAPONICA SEED OIL, SIMMONDSIA CHINENSIS SEED OIL, ORYZA SATIVA BRAN OIL, VITIS VINIFERA SEED OIL, MACADAMIA TERNIFOLIA SEED OIL, COPPER TRIPEPTIDE-34 HCL.
Is Peptide-132 Ultra Perfect Hair Bonding Oil Serum sulfate free?
Yes. There is no sulfate detergent anywhere in the ingredient list.
Is Peptide-132 Ultra Perfect Hair Bonding Oil Serum silicone free?
No. It contains Dimethicone, Dimethiconol, Disiloxane, Aminopropyl Dimethicone, which do not rinse out with a mild shampoo and will want clarifying eventually.
Is Peptide-132 Ultra Perfect Hair Bonding Oil Serum Curly-Girl friendly?
No — the formula contains a non-water-soluble silicone, which the method excludes.
What hair type is Peptide-132 Ultra Perfect Hair Bonding Oil Serum for?
By the weight and build-up of the formula it reads as suited to coily hair, curly hair, coarse hair, thick hair. It may be less comfortable on fine hair.
Does Peptide-132 Ultra Perfect Hair Bonding Oil Serum contain protein?
No. There is no hydrolyzed protein or amino acid in the ingredient list.
Does Peptide-132 Ultra Perfect Hair Bonding Oil Serum cause build-up?
Likely — Dimethicone, Dimethiconol, Disiloxane stay on the hair between washes. This is an estimate from the ingredient list, not a measurement.
Is Peptide-132 Ultra Perfect Hair Bonding Oil Serum safe for colour-treated hair?
Nothing in the formula is the kind of ingredient that strips colour, and it carries conditioning ingredients that help it hold.
Where does Peptide-132 Ultra Perfect Hair Bonding Oil Serum go in a haircare routine?
After shampooing: leave it on, then rinse it out.
Is Peptide-132 Ultra Perfect Hair Bonding Oil Serum fragrance free?
No. The list carries HEXYL CINNAMAL, LIMONENE, CITRONELLOL, LINALOOL, BENZYL BENZOATE.
Who makes Peptide-132 Ultra Perfect Hair Bonding Oil Serum?
COSRX, a brand based in Korea.