innisfree
Perfect 9 Intensive Serum 50ml
Dimethicone and cyclopentasiloxane are second and third, so this 50ml serum spreads as a silicone fluid rather than a watery one. Niacinamide is eighth and adenosine twenty-first.
No reviews yet50 ml
$145.00 per 100 ml
- Korean-market formula
- Ships from California or direct from Korea
- Korean barcode and batch code intact
- Suited to
- Dehydrated skinSensitive skinDull, uneven tone
- Helps with
- Shoppers looking for Niacinamide in a serumRoutines that want Niacinamide and Adenosine in one stepFilling the serum step with a Korean-market formula
In stock. Arrives in 3 to 7 business days
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- 30-day returns
- Free US shipping on orders of $100 or more
- Tracked delivery to your door
How it works
The Perfect 9 Intensive Serum is a 50ml serum, used after toner and before moisturizer, morning and evening. The active it is built around is Niacinamide, named eighth on its own ingredient list. The same list carries Adenosine, Tocopheryl Acetate and Tocopherol, so the active is not the only thing on it worth naming. How much of the Niacinamide stays on the skin, and for how long, is decided by the serum format rather than by the list alone. innisfree sells this Niacinamide serum in Korea, and this is that version.
Key benefits
- Niacinamide, the active this serum is built around
- Adenosine on the same list, an active
- Tocopheryl Acetate and Tocopherol on the same list, antioxidants
- Beta-Glucan on the same list, a polysaccharide
- Theobroma Cacao (Cocoa) Extract and Artemisia Vulgaris Extract further down the same list
- Houttuynia Cordata Extract and Rubus Idaeus (Raspberry) Fruit Extract further down the same list
Key actives
8Niacinamideactive
Niacinamide is vitamin B3, and it is the most studied active in Korean formulation. On this serum's own ingredient list it is named eighth.
13Tocopheryl Acetateantioxidant
Tocopheryl Acetate is a stable vitamin E ester that skin converts to tocopherol. It is used as an antioxidant and a light emollient and holds up better than plain vitamin E in a formula. The panel names it thirteenth on this serum's list, beside Niacinamide.
22Adenosineactive
Adenosine is a nucleoside that Korea's own cosmetic authority recognises as a wrinkle-care functional ingredient, which is why it appears on so many Korean lists at a low level. It is used for the look of fine lines and is stable and well tolerated. It is named twenty-second on this serum's list, alongside Niacinamide.
35Beta-Glucanpolysaccharide
Beta-Glucan is a polysaccharide from oats or yeast. It holds a large amount of water, forms a soothing film, and is one of the ingredients formulators reach for in products aimed at reactive skin. The panel names it thirty-fifth on this serum's list, beside Niacinamide.
37Tocopherolantioxidant
Tocopherol is vitamin E. It is an oil-soluble antioxidant that protects the oils in a formula from going rancid and works on skin as an emollient, and it is regularly paired with vitamin C because each keeps the other going for longer. It is named thirty-seventh on this serum's list, alongside Niacinamide.
Where does this serum go in my routine?
After toner and before moisturizer, morning and evening. Anything thinner than a serum goes on before it, and anything richer goes on after. If you are adding it to a routine you already like, give it a week on its own first, so what you see is the Niacinamide and not three changes at once.
Does this serum contain fragrance?
Yes. The ingredient list names Fragrance, Limonene, Linalool and Parfum. They sit on the panel printed on this page, so you can read the position for yourself before you buy. If fragrance components are something you avoid, this serum is not the one.
What else is on the list besides Niacinamide?
Adenosine, Tocopheryl Acetate and Tocopherol. The order they are printed in on this serum's panel is the order on the box, so you can see where Niacinamide sits relative to them. Further down the same panel: Beta-Glucan, Theobroma Cacao (Cocoa) Extract and Artemisia Vulgaris Extract.
Not on the ingredient list below: denatured or SD alcohol, essential oils, parabens, sulfate surfactants, mineral oil or petrolatum and added color.
Full INCI (38): Water/Aqua/Eau, Dimethicone, Cyclopentasiloxane, Butylene Glycol, Polysilicone-11, Glycerin, Glycereth-26, Niacinamide, Squalane, 1,2-Hexanediol, Polysorbate 20, Pantethine, Tocopheryl Acetate, Ammonium Acryloyldimethyltaurate/VP Copolymer, Polyacrylate-13, Polyisobutene, Fragrance/Parfum, Xanthan Gum, Disodium EDTA, Propanediol, Ethylhexylglycerin, Adenosine, Sorbitan Isostearate, Limonene, Dextrin, Theobroma Cacao Extract, Artemisia Vulgaris Extract, Houttuynia Cordata Extract, Rubus Idaeus Fruit Extract, Prunella Vulgaris Leaf Extract, Lonicera Japonica Flower Extract, Zanthoxylum Piperitum Fruit Extract, Taraxacum Officinale Rhizome/Root Extract, Ganoderma Lucidum Extract, Beta-Glucan, Linalool, Tocopherol, Sparassis Crispa Extract
Ingredient list read from inkeedecoder.com on 10 September 2026.
35 of 38 explained
- Water/Aqua/Eau solvent
- Water is the base almost every serum, toner and cream is built on. It dissolves the water-loving ingredients and sets how light the finished texture feels. On an INCI list it is usually first, which only means it is the largest single ingredient by weight.
- Dimethicone silicone
- Dimethicone is the most used cosmetic silicone. It forms a breathable film that smooths the surface, slows water leaving skin, and gives the slip that makes a primer or cream feel silky. It is inert and does not penetrate.
- Cyclopentasiloxane silicone
- Cyclopentasiloxane is a volatile silicone: it spreads a formula thin and smooth then evaporates, leaving no residue. It is the silicone behind a dry, powdery primer finish.
- Butylene Glycol humectant
- Butylene Glycol is a small glycol that does two jobs at once: it holds water in the top layer of skin and it dissolves plant extracts and actives that plain water cannot. It also thins a formula, which is why watery Korean essences lean on it.
- Polysilicone-11 silicone
- A silicone elastomer used as a film former and thickener. It gives a formula a soft cushioned body and helps it cling.
- Glycerin humectant
- Glycerin is the most used humectant in skincare. It draws water into the outer layer of skin and holds it there, and it is one of the very few ingredients whose hydrating effect is settled science rather than marketing. Higher amounts feel tacky, which is why it is usually blended.
- Glycereth-26 humectant
- Glycereth-26 is a modified glycerin that hydrates with far less stickiness than glycerin itself. It is a common way to load water into a formula that has to stay light.
- Niacinamide active
- Niacinamide is vitamin B3, and it is the most studied active in Korean formulation. It is used at roughly 2 to 5 percent for the look of uneven tone and visible pores, and it is water soluble, stable and comfortable beside almost every other active, which is why it turns up in so many lists.
- Squalane emollient
- Squalane is the stable, saturated version of squalene, a lipid human skin already makes. It is a light emollient that absorbs quickly, does not oxidise, and is one of the few oils widely considered safe for blemish-prone skin. Most cosmetic squalane is now from sugarcane or olive rather than shark.
- 1,2-Hexanediol humectant
- 1,2-Hexanediol is a glycol used for two reasons: it holds water like glycerin, and it makes a formula harder for microbes to live in, so less traditional preservative is needed. Korean formulas use it heavily for that second reason.
- Polysorbate 20 emulsifier
- Polysorbate 20 is a solubiliser: it dissolves small amounts of oil or fragrance into a watery formula so nothing separates or floats.
- Tocopheryl Acetate antioxidant
- Tocopheryl Acetate is a stable vitamin E ester that skin converts to tocopherol. It is used as an antioxidant and a light emollient and holds up better than plain vitamin E in a formula.
23 more explained
- Ammonium Acryloyldimethyltaurate/VP Copolymer thickener
- This is a synthetic thickener that gels quickly and holds an emulsion stable across a wide pH range. It gives a light, non-tacky body.
- Polyacrylate-13 thickener
- Polyacrylate-13 is a pre-neutralised thickener that gels instantly and holds an emulsion together, so a formula can be built without heat.
- Polyisobutene film former
- Polyisobutene is a synthetic polymer that forms a flexible, water-resistant film. It gives gloss and holds a formula in place, which is why it appears in lip products and long-wear textures.
- Fragrance/Parfum fragrance
- Fragrance, or Parfum, is a single declaration standing for a whole scent blend, which can be dozens of materials. Regulators allow it as a trade secret, so a list showing only this word does not say what the scent is made of. It is the most common trigger named by people with reactive skin.
- Xanthan Gum thickener
- Xanthan Gum is a polysaccharide made by fermenting sugar. It thickens a watery formula into a gel and holds the whole thing in suspension so nothing separates. Too much of it and a serum turns stringy, which is why it appears in fractions of a percent.
- Disodium EDTA chelator
- EDTA is a chelator: it locks up trace metal ions from water and packaging that would otherwise turn a formula cloudy, off-colour or rancid. It does nothing to skin and appears at a fraction of a percent.
- Propanediol humectant
- Propanediol is a plant-derived glycol used in place of propylene glycol. It hydrates, carries actives into solution, and gives a lighter, less sticky slip than glycerin at the same strength.
- Ethylhexylglycerin preservative booster
- Ethylhexylglycerin softens skin and boosts a preservative system, which is why it is nearly always sitting beside phenoxyethanol or 1,2-hexanediol. It also cuts down the odour bacteria produce, so it turns up in deodorising products.
- Adenosine active
- Adenosine is a nucleoside that Korea's own cosmetic authority recognises as a wrinkle-care functional ingredient, which is why it appears on so many Korean lists at a low level. It is used for the look of fine lines and is stable and well tolerated.
- Sorbitan Isostearate emulsifier
- Sorbitan Isostearate is a mild emulsifier that holds water into oil, the direction a cleansing balm or an oil-based cream needs.
- Limonene fragrance component
- Limonene is the citrus-peel aromatic. It appears here because EU labelling requires 26 fragrance components to be named individually rather than hidden inside "fragrance", and it is one of them.
- Dextrin thickener
- Dextrin is a starch fragment used to thicken and to give a formula a light, powdery finish. It is also a common carrier for powdered extracts.
- Theobroma Cacao Extract plant extract
- Cocoa Extract carries polyphenols and a little caffeine. It is used as an antioxidant plant extract and gives a faint warm tint.
- Artemisia Vulgaris Extract plant extract
- Common mugwort extract. It is the same genus as the Korean mugwort artemisia princeps and is used for the look of reddened, reactive skin.
- Houttuynia Cordata Extract plant extract
- Houttuynia Cordata is heartleaf, and it is one of the two or three anchor plants of Korean calming skincare. Its extract carries quercitrin and other flavonoids and is used for the look of redness and blemish-prone skin.
- Rubus Idaeus Fruit Extract plant extract
- Raspberry fruit extract, carrying fruit acids, sugars and anthocyanins. It is used as an antioxidant-rich conditioning extract.
- Lonicera Japonica Flower Extract plant extract
- Honeysuckle flower extract, the geumeunhwa of Korean herbal practice. It resists microbes as well as conditioning, so it often doubles as part of a preservative system.
- Zanthoxylum Piperitum Fruit Extract plant extract
- Zanthoxylum Piperitum is Korean pepper. Its fruit extract is used as a conditioning plant extract and is often paired with pulsatilla and usnea in Korean formulas.
- Ganoderma Lucidum Extract plant extract
- Reishi mushroom extract. Like most mushroom extracts it carries beta-glucan-type polysaccharides, which hold water and leave a light film.
- Beta-Glucan polysaccharide
- Beta-Glucan is a polysaccharide from oats or yeast. It holds a large amount of water, forms a soothing film, and is one of the ingredients formulators reach for in products aimed at reactive skin.
- Linalool fragrance component
- Linalool is a floral aromatic found in lavender, bergamot and coriander. It is one of the 26 fragrance components EU labelling requires to be declared by name.
- Tocopherol antioxidant
- Tocopherol is vitamin E. It is an oil-soluble antioxidant that protects the oils in a formula from going rancid and works on skin as an emollient, and it is regularly paired with vitamin C because each keeps the other going for longer.
- Sparassis Crispa Extract plant extract
- Cauliflower mushroom extract, one of the richest natural sources of beta-glucan. It hydrates and leaves a soft film.
- Market
- Korean market, the version sold in Korea
- Made in
- Republic of Korea
- Volume
- 50 ml
- Category
- Serum & Ampoule
- Ships from
- California or Korea
Orders ship from California or direct from Korea with tracked delivery to your door, and both routes carry the same Korean-market release. Shipping is free on orders of $100 or more. Returns are accepted for 30 days, by mail.
We split shipments free, so one out-of-stock item never holds up the rest of your order.
Where this unit came from
- 1Seoul
Bought as Korean-market stock - 2Barcode
Listed against the Korean barcode on its box - 3California or Korea
Ships to you from either, as the same Korean-market release
We stock the version of a formula that is sold in Korea, not the release a brand prepares for another market under the same name.
Every unit keeps its original barcode and batch code intact, so the unit in your hands can be checked against the brand’s own records.
Every order ships from California or direct from Korea, and returns run for 30 days.
Every claim on this page traces to the unit in the box, the barcode, the batch code and the price you can read for yourself.
Inside the formula
Inside the formula
- 8Niacinamide
- 13Tocopheryl Acetate
- 22Adenosine
- 35Beta-Glucan
Where each key active sits on the declared ingredient list, by entry number. Position is proportion: the further forward, the larger its share.
How to use
- Apply a few drops to clean skin after toner or essence and before moisturizer, morning and/or night, pressing it in rather than rubbing.
Worth knowing
- Patch test this serum on a small area and wait a day before using it more widely, especially with Niacinamide on the list.
- This list names Fragrance, Limonene and Linalool, so skip it if fragrance components are something you avoid.
Complete the routine
- This iteminnisfree Perfect 9 Intensive Serum 50ml$72.50
- From the same Korean-market lineinnisfree My Hair Recipe Strength Shampoo 330ml$17.50
- The treatment step of this routineinnisfree My Hair Recipe Strength Tonic Essence 100ml$15.00
Total for 3 items$105.00
Reviews
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innisfree Perfect 9 Intensive Serum 50ml
How it felt, how your skin took it, what you layer it with. Straight answers help the next person choose.
innisfree, Korean-market original
The Original Korean Formula serum from innisfree, 50ml formulated with Niacinamide and Adenosine, shipped from California or direct from Korea.
Verify your unit when it arrives
Verify your unit when it arrives
Korean-market stock with the original barcode and batch code intact, exactly as it left Korea.
On the unit itself
- The Korean-market barcode, unaltered from the retail package.
- The manufacturer’s batch code, exactly as the maker printed it.
정품Genuine article, Korean-market stock
What professionals say
What professionals say
What skin-care professionals say about the key actives in this formula, quoted from the medical sources linked beside each.
People with dry, flaky skin are more likely to see a benefit from using vitamin E because it enhances moisturization.
Amy Kassouf, MDDermatologist, Cleveland Clinic It can be especially useful for skin that is easily irritated or prone to redness, including conditions such as rosacea, eczema and contact dermatitis.
Derrick Phillips, MDConsultant dermatologist, Vogue
1 more professional perspective
Niacinamide helps reduce the appearance of pores in a few ways. By strengthening the skin barrier and improving elasticity, pores appear less noticeable and more even.
Ashlyn YankeAesthetician, Cleveland Clinic
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