Sungboon Editor
Deep Collagen CICA Teatree Soothing Mask$11.76Blemish Care Sleeping Pack 50ml
isoi Blemish Care Sleeping Pack is a 50ml sleeping mask whose ingredient list carries Arbutin alongside Euterpe Oleracea (Acai) Fruit Extract and Vaccinium Angustifolium Fruit Extract.
No reviews yet50 ml
$140.00 per 100 ml
- Korean-market formula
- Ships from California or direct from Korea
- Korean barcode and batch code intact
- Suited to
- Oily skinCombination skinBlemish-prone skin
- Helps with
- Skin that looks congested or blemish-proneFitting a Korean-market step into an existing routineShoppers who want the same formula sold on shelves in Korea
In stock. Arrives in 3 to 7 business days
We accept
You’re $100.00 away from free US shipping.
- 30-day returns
- Free US shipping on orders of $100 or more
- Tracked delivery to your door
How it works
The Blemish Care Sleeping Pack is a 50ml sleeping mask, used as the final step of the evening routine, over your usual moisturizer or in place of it. The active it is built around is Arbutin, named fifth on its own ingredient list. The same list carries Euterpe Oleracea (Acai) Fruit Extract, Vaccinium Angustifolium Fruit Extract and Vaccinium Macrocarpon (Cranberry) Fruit Extract, so the active is not the only thing on it worth naming. How much of the Arbutin stays on the skin, and for how long, is decided by the sleeping mask format rather than by the list alone. This is the Original Korean Formula, the sleeping mask isoi sells in Korea, Arbutin and all.
Key benefits
- Arbutin, the active this sleeping mask is built around
- Euterpe Oleracea (Acai) Fruit Extract, Vaccinium Angustifolium Fruit Extract, Vaccinium Macrocarpon (Cranberry) Fruit Extract and Houttuynia Cordata Extract on the same list, plant extracts
- Olea Europaea (Olive) Leaf Extract and Castanea Crenata (Chestnut) Shell Extract further down the same list
- Salix Alba (Willow) Bark Extract and Centella Asiatica Extract further down the same list
- Arbutin named fifth on the manufacturer list printed on this page
- The Korean-market release of this sleeping mask, confirmed against its Korean barcode
How to use
- Apply as the last step of a nighttime routine, over or in place of a regular moisturizer, and leave on overnight. Rinse with lukewarm water in the morning.
Where does this sleeping mask go in my routine?
As the final step of the evening routine, over your usual moisturizer or in place of it. Toner goes on before it, and the rest of the routine goes on after you take the sleeping mask off. 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 Arbutin and not three changes at once.
Is this the Korean-market sleeping mask or a US version?
The Korean-market one, Arbutin and all. We match this sleeping mask to its Korean barcode before it reaches the shelf, which is the check that tells you which market release you are holding.
Does this sleeping mask contain fragrance?
Yes. The ingredient list names Citronellol and Geraniol. 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 sleeping mask is not the one.
What else is on the list besides Arbutin?
Euterpe Oleracea (Acai) Fruit Extract, Vaccinium Angustifolium Fruit Extract and Vaccinium Macrocarpon (Cranberry) Fruit Extract. The order they are printed in on this sleeping mask's panel is the order on the box, so you can see where Arbutin sits relative to them. Further down the same panel: Houttuynia Cordata Extract, Olea Europaea (Olive) Leaf Extract and Castanea Crenata (Chestnut) Shell Extract.
Not on the ingredient list below: fragrance or parfum, denatured or SD alcohol, silicones, parabens, sulfate surfactants, mineral oil or petrolatum and added color.
Full INCI (36): Water, Glycerin, Caprylic/Capric Triglyceride, Pentaerythrityl Tetraisostearate, Arbutin, Trehalose, Betaine, Xanthan Gum, Panthenol, Rosa Damascena Flower Oil, Euterpe Oleracea Fruit Extract, Vaccinium Angustifolium (Blueberry) Fruit Extract, Phyllanthus Emblica Fruit Extract, Vaccinium Macrocarpon (Cranberry) Fruit Extract, Rosa Damascena Flower Water, Houttuynia Cordata Extract, Rhus Semialata Gall Extract, Olea Europaea (Olive) Leaf Extract, Chrysanthemum Indicum Flower Extract, Sophora Japonica Bud Extract, Prunella Vulgaris Leaf Extract, Castanea Crenata Shell Extract, Salix Alba (Willow) Bark Extract, Centella Asiatica Extract, Eclipta Prostrata Extract, Coccinia Indica Fruit Extract, Coptis Japonica Root Extract, Arginine, Carbomer, Butylene Glycol, 1,2-Hexanediol, Scutellaria Baicalensis Root Extract, Paeonia Suffruticosa Root Extract, Glycyrrhiza Glabra (Licorice) Root Extract, Citronellol, Geraniol
Ingredient list read from isoi.co.kr on 30 August 2026.
31 of 36 explained
- Water 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.
- 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.
- Caprylic/Capric Triglyceride emollient
- Caprylic/Capric Triglyceride is the light fraction of coconut oil, with the heavy parts removed. It is the workhorse emollient of modern formulas: it softens skin, dissolves oil-soluble actives and absorbs without the greasy weight of a whole plant oil.
- Pentaerythrityl Tetraisostearate emollient
- A thick, cushioned ester that gives lip and balm formulas their gloss and their cling. It is heavy enough to stay where it is put.
- Arbutin active
- Arbutin is the naturally occurring form of the same compound, from bearberry and related plants, used for the look of uneven tone. The alpha isomer is the more stable of the two.
- Trehalose humectant
- Trehalose is a sugar that some desert plants use to survive drying out. In skincare it is a humectant that holds water in the outer layer and helps a formula feel comfortable rather than tight.
- Betaine humectant
- Betaine is a sugar-beet-derived humectant that cells use to hold water. In a formula it hydrates and takes the edge off cleansers and acids, which is why it often appears alongside them.
- 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.
- Panthenol humectant
- Panthenol is pro-vitamin B5: skin converts it to pantothenic acid. It is a humectant that holds water and leaves skin feeling soft and less tight, and it is one of the ingredients formulators reach for when a formula also contains something harsh.
- Rosa Damascena Flower Oil fragrance component
- Rosa Damascena Flower Oil is rose essential oil, one of the most expensive materials in perfumery. It scents a formula, and like every essential oil it is a class reactive skin often does not tolerate.
- Euterpe Oleracea Fruit Extract plant extract
- Acai fruit extract, from the Amazonian palm berry. It carries anthocyanins, the same purple pigment polyphenols found in blueberry, and is used as a plant antioxidant.
- Vaccinium Angustifolium (Blueberry) Fruit Extract plant extract
- Lowbush blueberry fruit extract, high in anthocyanins. Berry extracts are used as plant antioxidants and can tint a formula.
19 more explained
- Vaccinium Macrocarpon (Cranberry) Fruit Extract plant extract
- Cranberry fruit extract, acidic and high in proanthocyanidins. It is used as an antioxidant berry extract.
- Rosa Damascena Flower Water plant extract
- Rosa Damascena Flower Water is the water left from distilling rose petals. It is used in place of plain water as a base and carries the scent and trace compounds of the distillation.
- 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.
- Olea Europaea (Olive) Leaf Extract plant extract
- Olive leaf extract, carrying oleuropein. It is used as a plant antioxidant, and it is a different ingredient from the pressed fruit oil.
- Castanea Crenata Shell Extract plant extract
- Chestnut Shell Extract carries tannins and is used as an antioxidant plant extract, most often in formulas aimed at visible pores.
- Salix Alba (Willow) Bark Extract plant extract
- Willow Bark Extract carries salicin, the plant compound salicylic acid is related to. The two are not interchangeable: willow bark is a mild clarifying extract, not a BHA exfoliant at the levels used in cosmetics.
- Centella Asiatica Extract plant extract
- Centella Asiatica is the plant behind the whole cica category, sold as gotu kola or Madagascar centella. Its extract is the anchor of Korean formulas built for easily reddened skin, and its work is done by four triterpenes: asiaticoside, madecassoside, asiatic acid and madecassic acid.
- Eclipta Prostrata Extract plant extract
- Eclipta Prostrata is false daisy, long used in Ayurvedic and East Asian practice. Its extract is used as a conditioning plant extract, most often in scalp and hair formulas.
- Coccinia Indica Fruit Extract plant extract
- Coccinia Indica is ivy gourd. Its fruit extract is used as a conditioning, hydrating plant extract in Korean formulas.
- Coptis Japonica Root Extract plant extract
- Coptis Japonica is a traditional East Asian medicinal root, bright yellow from its berberine content. In skincare its extract is used for the look of congested, oily skin.
- Arginine amino acid
- Arginine is an amino acid that does two jobs here: it holds water in the outer layer of skin, and it neutralises acidic gelling agents, which is why it often stands in for a synthetic pH adjuster.
- Carbomer thickener
- Carbomer is a synthetic polymer that only gels once a base neutralises it, which is why arginine or tromethamine sits nearby on the list. It gives the clear, non-stringy gel texture a xanthan formula cannot reach.
- 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.
- 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.
- Scutellaria Baicalensis Root Extract plant extract
- Scutellaria Baicalensis is Chinese skullcap. Its root extract carries baicalin, a well studied plant antioxidant, and it is used for the look of redness.
- Paeonia Suffruticosa Root Extract plant extract
- Paeonia Suffruticosa is tree peony, a long-standing East Asian medicinal plant. Its root extract carries paeoniflorin and is used for the look of reddened skin.
- Glycyrrhiza Glabra (Licorice) Root Extract plant extract
- Licorice Root Extract carries glabridin and liquiritin. It is one of the classic plant ingredients used for the look of uneven tone and redness, and it appears in almost every brightening formula that avoids synthetic actives.
- Citronellol fragrance component
- Citronellol is a rose-geranium aromatic and one of the 26 fragrance components EU labelling names individually.
- Geraniol fragrance component
- Geraniol is a rose-scented aromatic found in geranium and citronella oils. It is one of the 26 declarable fragrance components.
- Market
- Korean market, the version sold in Korea
- EAN (barcode)
- 8809772620452
- Made in
- Republic of Korea
- Volume
- 50 ml
- Category
- Mask
- Actives
- Arbutin, Centella Asiatica, Heartleaf (Houttuynia Cordata), Licorice Root, Panthenol, Trehalose
- 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. The barcode in the specification above is the Korean-market one and it is printed on the box you receive.
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
Worth knowing
- Introduce any new product gradually rather than adding several new steps to a routine at once, so a reaction is easy to trace back to the right cause.
- Patch test on a small area first and wait a day before applying it to the full face, especially the first time you use it.
Complete the routine
- This itemisoi Blemish Care Sleeping Pack 50ml$70.00

- The treatment step of this routineisoi Bulgarian Rose Blemish Care Spot 25ml$45.00

- Seal the routine in as the last stepisoi Bulgarian Rose Intensive Treatment Lotion 90ml$95.00

Total for 3 items$210.00
Reviews
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isoi Blemish Care Sleeping Pack 50ml
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isoi, Korean-market original
The Original Korean Formula sleeping mask from isoi, 50ml formulated with Arbutin and Euterpe Oleracea (Acai) Fruit Extract, 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 skin care, quoted from the medical sources linked beside each.
Your skin barrier is basically your outer layer of the skin.
Melissa Piliang, MDDermatologist, Cleveland Clinic Pretty much every step of a Korean skin care routine is going to have some component of hydration.
Alok Vij, MDDermatologist, Cleveland Clinic
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