COSRX
5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask$4.70innisfree
Vitamin C Active Mask 25ml X 5ea
innisfree Vitamin C Active Mask is a sheet mask whose ingredient list carries Magnesium Ascorbyl Phosphate alongside Niacinamide and Allantoin.
No reviews yet- 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 Magnesium Ascorbyl Phosphate in a sheet maskRoutines that want Magnesium Ascorbyl Phosphate and Niacinamide in one stepFilling the sheet mask step with a Korean-market formula
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 Vitamin C Active Mask is a sheet mask, used after toner, in place of your serum step, in the evening. The antioxidant it is built around is Magnesium Ascorbyl Phosphate, named seventeenth on its own ingredient list. The same list carries Niacinamide, Allantoin and Paeonia Suffruticosa Root Extract, so the antioxidant is not the only thing on it worth naming. How much of the Magnesium Ascorbyl Phosphate stays on the skin, and for how long, is decided by the sheet mask format rather than by the list alone. innisfree sells this Magnesium Ascorbyl Phosphate sheet mask in Korea, and this is that version.
Key benefits
- Magnesium Ascorbyl Phosphate, the antioxidant this sheet mask is built around
- Niacinamide and Allantoin on the same list, actives
- Paeonia Suffruticosa Root Extract and Houttuynia Cordata Extract on the same list, plant extracts
- Melaleuca Alternifolia (Tea Tree) Leaf Extract and Artemisia Princeps Leaf Extract further down the same list
- Arginine and Panthenol further down the same list
- Magnesium Ascorbyl Phosphate named seventeenth on the manufacturer list printed on this page
Key actives
5Niacinamideactive
Niacinamide is vitamin B3, and it is the most studied active in Korean formulation. The panel names it fifth on this sheet mask's list, beside Magnesium Ascorbyl Phosphate.
11Allantoinactive
Allantoin is a comfrey-derived compound used to condition skin and soften the outer layer so it feels smoother. It is one of the standard additions to a formula built for easily irritated skin. The panel names it eleventh on this sheet mask's list, beside Magnesium Ascorbyl Phosphate.
17Magnesium Ascorbyl Phosphateantioxidant
Magnesium Ascorbyl Phosphate is a stable, water-soluble vitamin C salt. It works at a near-neutral pH, so it suits formulas built for skin that finds pure ascorbic acid stinging. The name on the box points at it, and it is named seventeenth on this sheet mask's own ingredient list.
21Paeonia Suffruticosa Root Extractplant 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. It is named twenty-first on this sheet mask's list, alongside Magnesium Ascorbyl Phosphate.
23Houttuynia Cordata Extractplant 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. The panel names it twenty-third on this sheet mask's list, beside Magnesium Ascorbyl Phosphate.
Where does this sheet mask go in my routine?
After toner, in place of your serum step, in the evening. Toner goes on before it, and the rest of the routine goes on after you take the sheet 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 Magnesium Ascorbyl Phosphate and not three changes at once.
What else is on the list besides Magnesium Ascorbyl Phosphate?
Niacinamide, Allantoin and Paeonia Suffruticosa Root Extract. The order they are printed in on this sheet mask's panel is the order on the box, so you can see where Magnesium Ascorbyl Phosphate sits relative to them. Further down the same panel: Houttuynia Cordata Extract, Melaleuca Alternifolia (Tea Tree) Leaf Extract and Artemisia Princeps Leaf Extract.
Not on the ingredient list below: fragrance or parfum, denatured or SD alcohol, essential oils, silicones, parabens, sulfate surfactants, mineral oil or petrolatum and added color.
Full INCI (25): Water/Aqua/Eau, Propanediol, Butylene Glycol, Glycerin, Niacinamide, 1,2-Hexanediol, Panthenol, Betaine, Carbomer, Arginine, Allantoin, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Xanthan Gum, Ethylhexylglycerin, Glyceryl Caprylate, Sodium Phytate, Magnesium Ascorbyl Phosphate, Sorbitan Isostearate, Hydrolyzed Corn Starch, Sodium Hyaluronate, Paeonia Suffruticosa Root Extract, Sucrose, Houttuynia Cordata Extract, Melaleuca Alternifolia Extract, Artemisia Princeps Leaf Extract
Ingredient list read from inkeedecoder.com on 10 September 2026.
25 of 25 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- Allantoin active
- Allantoin is a comfrey-derived compound used to condition skin and soften the outer layer so it feels smoother. It is one of the standard additions to a formula built for easily irritated skin.
- Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer thickener
- This is the thickener behind most gel-cream textures. It builds a soft, bouncy gel that collapses to a light fluid as it is rubbed in.
13 more explained
- 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.
- 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.
- Glyceryl Caprylate emulsifier
- Glyceryl Caprylate is a mild emulsifier that also makes a formula less hospitable to microbes, so it is often part of a preservative-free system.
- Sodium Phytate chelator
- Sodium Phytate is a rice-derived chelator used in place of EDTA. It ties up trace metals so the formula stays stable and its colour and scent hold.
- Magnesium Ascorbyl Phosphate antioxidant
- Magnesium Ascorbyl Phosphate is a stable, water-soluble vitamin C salt. It works at a near-neutral pH, so it suits formulas built for skin that finds pure ascorbic acid stinging.
- 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.
- Hydrolyzed Corn Starch absorbent
- Hydrolyzed Corn Starch is starch broken into smaller fragments. It gives a silky, powdery slip and absorbs a little oil.
- Sodium Hyaluronate humectant
- Sodium Hyaluronate is the salt of hyaluronic acid, and it is what most products labelled hyaluronic actually contain. The salt dissolves more readily and the molecule is smaller, so it sits in the outer layer of skin rather than only on top of it.
- 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.
- Sucrose humectant
- Sucrose is table sugar, used here as a humectant. It draws water into the outer layer of skin and, in a scrub, doubles as the physical grain.
- 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.
- Melaleuca Alternifolia Extract plant extract
- Tea Tree Leaf Extract is the water-based extract rather than the essential oil, so it is far milder and much less aromatic. It is used in formulas for blemish-prone skin.
- Artemisia Princeps Leaf Extract plant extract
- Artemisia Princeps is Korean mugwort, one of the country's oldest skincare and bathing plants. Its leaf extract is used for the look of reddened, reactive skin, and it is the ingredient behind the mugwort category.
- Market
- Korean market, the version sold in Korea
- Made in
- Republic of Korea
- Category
- Mask
- 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
- 5Niacinamide
- 11Allantoin
- 17Magnesium Ascorbyl
- 21Paeonia Suffruticosa
- 23Houttuynia Cordata
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 to clean skin following the timing on the pack, then remove or rinse as directed. Most masks in this format are a once- or twice-weekly treatment step rather than a daily one.
Worth knowing
- Patch test this sheet mask on a small area and wait a day before using it more widely, especially with Magnesium Ascorbyl Phosphate on the list.
- Introduce this sheet mask on its own for the first week, so anything your skin does is traceable to the Magnesium Ascorbyl Phosphate rather than to three changes at once.
Complete the routine
- This iteminnisfree Vitamin C Active Mask 25ml X 5ea$30.00

- 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$62.50
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innisfree Vitamin C Active Mask 25ml X 5ea
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innisfree, Korean-market original
The Original Korean Formula sheet mask from innisfree, formulated with Magnesium Ascorbyl Phosphate and Niacinamide, 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.
Using topical vitamin C can result in less cell damage and better-looking skin.
Melissa Piliang, MDDermatologist, Cleveland Clinic Allantoin can tone down the dryness of the individual cells. It increases the water content of the skin, which means it helps to hydrate and moisturize.
Wilma Bergfeld, MDDermatologist, Cleveland Clinic
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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