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 Methyl Diisopropyl Propionamide and not three changes at once.

What else is on the list besides Methyl Diisopropyl Propionamide?

Caffeine, Coptis Japonica Root Extract and Theobroma Cacao (Cocoa) Extract. The order they are printed in on this sheet mask's panel is the order on the box, so you can see where Methyl Diisopropyl Propionamide sits relative to them. Further down the same panel: Trehalose, Inositol and Honey Extract.

Anua

8 Hyaluronic Acid Catechin Cool Slim Mask

Name: Anua 8 Hyaluronic Acid Catechin Cool Slim Mask
Brand: Anua
Price: 17.99 USD
Availability: OutOfStock

Anua 8 Hyaluronic Acid Catechin Cool Slim Mask is a 1ea sheet mask with Methyl Diisopropyl Propionamide, used after toner, in place of your serum step, in the evening.

Reviewed by Nurcan Saglam, licensed dermo-cosmetic expert (Paris)

No reviews yet

$17.99

1ea

Korean-market formula
Ships from California or direct from Korea
Korean barcode and batch code intact

Suited to: Normal skinDry or dehydrated skinCombination skinSensitized or easily reactive skin

Helps with: Everyday hydrationA layered Korean routineDullness or uneven texture

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Key benefits

Methyl Diisopropyl Propionamide, the active this sheet mask is built around
Caffeine on the same list, an active
Coptis Japonica Root Extract and Theobroma Cacao (Cocoa) Extract on the same list, plant extracts
Trehalose on the same list, a humectant
Inositol and Honey Extract further down the same list
Methyl Diisopropyl Propionamide named seventeenth on the manufacturer list printed on this page

Key actives

5Trehalosehumectant

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. The panel names it fifth on this sheet mask's list, beside Methyl Diisopropyl Propionamide.

All products with Trehalose

16Coptis Japonica Root Extractplant 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. The panel names it sixteenth on this sheet mask's list, beside Methyl Diisopropyl Propionamide.

All products with Coptis Japonica Root Extract

17Methyl Diisopropyl Propionamideactive

A synthetic cooling agent that gives the cool feeling of menthol without the mint smell. It is used where a formula wants the sensation but not the scent. On this sheet mask's own ingredient list it is named seventeenth.

All products with Methyl Diisopropyl Propionamide

21Caffeineactive

Caffeine constricts small blood vessels near the surface, which is why eye products use it for the look of puffiness and shadow. It is water soluble and works only while it is on the skin. It is named twenty-first on this sheet mask's list, alongside Methyl Diisopropyl Propionamide.

All products with Caffeine

Theobroma Cacao (Cocoa) Extractplant extract

Cocoa Extract carries polyphenols and a little caffeine. It is used as an antioxidant plant extract and gives a faint warm tint. The panel names it twenty-fifth on this sheet mask's list, beside Methyl Diisopropyl Propionamide.

All products with Theobroma Cacao (Cocoa) Extract

Inside the formula

Ingredients declared

No fragrance

on the list

5Trehalose16Coptis Japonica21Caffeine

5Trehalose
16Coptis Japonica
21Caffeine

Where each key active sits on the declared ingredient list, by entry number. Position is proportion: the further forward, the larger its share.

1 of 4

Anua 8 Hyaluronic Acid Catechin Cool Slim Mask

22 of 25 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.
Dipropylene Glycol humectant: Dipropylene Glycol is a glycol used as a solvent and a light humectant. Its main job is keeping the rest of the formula dissolved and the texture fluid rather than adding hydration of its own.
Methylpropanediol humectant: Methylpropanediol is a small glycol used to hydrate and to help water-soluble actives penetrate the outer layer of skin more evenly. It leaves almost no tack, which suits watery textures.
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.
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.
Hydroxyacetophenone preservative booster: Hydroxyacetophenone is an antioxidant that also strengthens a preservative system, so a formula needs less traditional preservative. Korean formulas pair it with 1,2-hexanediol constantly.
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.
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.
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.
Octyldodeceth-16 emulsifier: An ethoxylated branched fatty alcohol. It emulsifies and also gives a formula a soft, cushioned slip.
Inositol humectant: Inositol is a sugar-like compound found in the body. In skincare it is a humectant that also helps a formula feel conditioning rather than merely wet.
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.

10 more explained

Acrylates/C10-30 Alkyl Acrylate Crosspolymer thickener: This is a carbomer relative with fatty side chains, so it thickens and stabilises an emulsion at the same time. It gives a light gel-cream body rather than a heavy one.
Glyceryl Glucoside humectant: Glyceryl Glucoside is glycerin bound to glucose, from the resurrection plant. It is a humectant that holds water in the outer layer of skin.
Tromethamine pH adjuster: Tromethamine neutralises acidic thickeners such as carbomer so they gel, and holds a formula near skin-friendly pH. It is used at a fraction of a percent.
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.
Methyl Diisopropyl Propionamide active: A synthetic cooling agent that gives the cool feeling of menthol without the mint smell. It is used where a formula wants the sensation but not the scent.
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.
Hydrogenated Lecithin emulsifier: Hydrogenated Lecithin is lecithin with its unsaturated bonds filled in, which makes it far more stable. It emulsifies and is the standard shell for the liposomes that carry actives into the outer layer of skin.
Caffeine active: Caffeine constricts small blood vessels near the surface, which is why eye products use it for the look of puffiness and shadow. It is water soluble and works only while it is on the skin.
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 (Cocoa) Seed 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.

How it works

The 8 Hyaluronic Acid Catechin Cool Slim Mask is a 1ea sheet mask, used after toner, in place of your serum step, in the evening. The active it is built around is Methyl Diisopropyl Propionamide, named seventeenth on its own ingredient list. The same list carries Caffeine, Coptis Japonica Root Extract and Theobroma Cacao (Cocoa) Extract, so the active is not the only thing on it worth naming. How much of the Methyl Diisopropyl Propionamide stays on the skin, and for how long, is decided by the sheet mask format rather than by the list alone. Anua sells this Methyl Diisopropyl Propionamide sheet mask in Korea, and this is that version.

How to use

Use the 8 Hyaluronic Acid Catechin Cool Slim Mask after toner, in place of your serum step, in the evening.
Unfold the sheet, line it up at the eyes first, then smooth it outward so no air is trapped underneath.
Take it off at the time printed on the pack, pat in the essence left behind rather than rinsing, then go straight to your moisturizer.
Two or three evenings a week is a normal rhythm. Do not leave it on past its time; a sheet that has gone dry takes moisture back off the face as it goes.

Worth knowing

Patch test on the inner arm before applying to the face, as with any new skincare formula.
Introduce a new active gradually into an existing routine rather than adding several new products at once.

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Anua 8 Hyaluronic Acid Catechin Cool Slim Mask

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Anua, Korean-market original

The Original Korean Formula sheet mask from Anua, 1ea formulated with Methyl Diisopropyl Propionamide and Caffeine, shipped from California or direct from Korea.

Verify your unit when it arrives

Korean-market stock with the original barcode and batch code intact, exactly as it left Korea.

Anua uses a holographic QR seal that only the HiddenTag app can read. Install HiddenTag from your phone’s app store and scan the seal on the box. A camera app alone will not resolve it.

Source: Anua packaging, HiddenTag scheme

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 skin-care professionals say about skin care, quoted from the medical sources linked beside each.

It has also been proven that caffeine stimulates lipolysis, which Lupo et al postulated may contribute to improvements in lower eyelid sagging and puffiness.
Stacey J. PilkingtonDO, Azeal Dermatology Institute, The Journal of Clinical and Aesthetic Dermatology
Pretty much every step of a Korean skin care routine is going to have some component of hydration.
Alok Vij, MDDermatologist, Cleveland Clinic