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KOREAN PHARMACY

A Korean glass skin routine, built from the ingredient list

Glass skin is not a skin type and not a product. It is what a face looks like when the outer layer is full of water, lying flat and calm: a smooth, hydrated surface sends light back in one direction instead of scattering it, and that single reflection is the whole look. So the routine has three jobs at once. Get water into the stratum corneum, keep the surface free of flaking and redness, and even out tone so the reflection reads as clear rather than shiny.

That is why this routine ranks humectants first, and ranks them by position: sodium hyaluronate, beta-glucan, trehalose and panthenol high on a toner list are what make the Korean layering step work. After them come the ferments and rice extracts Korean glow formulas are built around, niacinamide for evenness, and the polyhydroxy acids in place of glycolic acid, because a glass finish disappears the moment exfoliation tips into irritation. The seal step is ranked on squalane and the ceramides, not on butters and waxes. Shine from a heavy cream sitting on the surface is a different look, and it is gone by lunch.

Built for skin that sits comfortably through the day. Ranked against 3,327 published ingredient lists across 5,102 products you can buy today. Reset to the standard version

The routine

  1. 1Morning and night

    Cleanse

    Everything after this lands on bare skin, so this is the step that decides what the rest of the routine is working with.

    ThenGo straight on to the next step while skin is still damp. A humectant layer applied to a damp face has water to hold on to.

    Swap it: 4 other products that clear the same filters

  2. 2Morning and night

    Prep

    The watery layer. It rehydrates after cleansing and thins the ground so the treatment step spreads instead of sitting.

    ThenAbout thirty seconds. Long enough to stop sliding, short enough that the skin is still damp underneath.

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  3. 3Morning and night

    Treat

    The step chosen for the answer you gave. This is where the actives are, and it is the one product in the routine worth reading the whole list of.

    ThenA full minute. This layer is the one that most rewards being left alone before it is covered.

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  4. 4Evening only

    Seal

    The lid. Without it the water the first three steps brought in leaves again, which is the mechanism behind skin that feels wonderful at 8am and tight at 2pm.

    ThenA minute or two in the morning before the last step goes on.

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  5. 5Morning only

    Morning finish

    The last thing on in the morning, over everything else, never mixed into the step before it.

    ThenLet it set before anything touches it.

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  6. 6Evening only

    Twice a week

    Not a daily step. It goes in after cleansing, in place of the prep layer, on the two evenings a week you use it.

    ThenFollow it with the seal step the same evening. Skip the treat step on the nights you use this one.

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Using this routine

How to apply it

Layer the watery step, thinly and more than once

The step that makes this a glass skin routine is the prep layer, and the Korean way to use it is in thin passes rather than one generous one. Pour a little into your palms, press it into damp skin, wait until it stops feeling wet, then do it again. Two or three passes is the useful range; past that you are adding film, not water.

Thin layers work because a humectant can only hold the water it is spread through. A thick coat sits on the surface and turns tacky, while three light ones each settle into the top of the stratum corneum and leave it evenly full. The treatment step goes on next, over a surface that is already hydrated, and spreads further for it.

Cleanse gently first. A cleanser that leaves skin squeaky has taken the surface lipids with it, and the rest of the routine then spends itself putting back what the first step removed.

Morning and night

Morning and night are two different routines

Morning is the short version: a rinse or a gentle cleanse, one or two passes of the prep step, the treatment step, a light seal, then the morning finish step last of all. Keep the seal light in the morning. A rich cream under the finish step reads as shine by midday, and shine is not the look.

Night is where the layering earns its time. If you wore the finish step or makeup, cleanse twice: an oil or balm first to lift it, then the water-based cleanser. Then the full prep layering, the treatment step, and the seal, which can be the richer of the two at night because nobody sees it until morning.

The twice-weekly step goes in at night in place of the prep layer, never on top of it, and never on the same night as a retinoid.

What undoes it

What takes the glass finish away

Over-exfoliation is the commonest cause, and it works against the look directly. A stressed barrier flakes and reddens, flakes scatter light, and redness breaks the even tone the reflection depends on. That is why this routine ranks gluconolactone and lactobionic acid rather than glycolic acid, and why the acid step is twice a week, not nightly.

Heavy occlusives in the morning, fragrance on reactive skin, and skipping the seal are the other three. Without a seal step, the water the prep layers brought in evaporates through the day, and skin that looked glassy at eight looks matte and tight by three.

If you use a retinoid

Where a retinoid fits

A retinoid is compatible with a glass skin routine, and in its first weeks it is the active most likely to undo the look, because early retinoid use flakes. Put it in the night routine after the prep layers and before the seal, start at two nights a week, and keep those nights free of the twice-weekly acid step.

Choose between retinal and retinol with that adjustment period in mind: retinol is the gentler place to start, and retinal is the stronger step once a retinol is comfortable.

Retinal vs retinol, and how to start either

Asked about this routine

What is glass skin?

Glass skin is the Korean name for skin so evenly hydrated and smooth that it looks clear and reflects light like a pane of glass. It describes a finish, not a skin type, and it comes from water in the outer layer of skin, a calm surface and even tone rather than from any single product.

How many layers of toner should I use for glass skin?

Two or three thin passes of the prep step, each pressed in once the last has stopped feeling wet. More than three adds film rather than water, and a tacky surface reads as sticky, not glassy.

Can oily skin get glass skin?

Yes, and oily skin often gets there sooner, because its surface already has lipids. Keep the layering, choose a gel or lotion for the seal, and answer the second question in the routine builder with “Shiny, especially the T-zone” so the seal step re-ranks toward lighter textures.

Does a glass skin routine need an exfoliant?

A gentle one, twice a week at most. Polyhydroxy acids such as gluconolactone and lactobionic acid smooth the surface with less irritation than glycolic acid, and irritation is what ends a glass finish. A nightly acid habit works against the look.

Not quite you?

Change an answer and the whole thing re-ranks. The result keeps its own URL.

Change the answers
1What is your skin doing?
2How does it feel by two in the afternoon?

A better question than skin type, because it is answerable by looking. It is also the one that decides gel against cream.

3What can your skin not have?

Optional, and the reason this works. Rule something out and we only offer products whose own declared ingredient list names none of it.

Reading the reasoning

Each step says which entries it matched and where they sit on that product’s own declared list. “Panthenol 4th of 34” means panthenol is the fourth of thirty-four ingredients, and because an ingredient list runs from the highest concentration down to one percent, fourth of thirty-four is a formulation decision and thirty-first of thirty-four usually is not.

The positions are the whole argument, and they are checkable. Open any product on this page and the full list is printed there, unabridged and not as an image, which is the one field where this store beats every competitor in the category. If a position here disagrees with the list there, the list there is right and we have a bug worth telling us about.

One rule overrules the ranking, and it is the only one. A routine may carry at most one exfoliating acid or retinoid step, and the treatment step is the one that gets it, because the treatment step is what the actives step is. A toner is a hydrating layer and a moisturiser is a lid; neither is where a second acid belongs, whatever it ranks. Left to the ranking alone this page once offered a glycolic toner, an AHA-BHA serum and a lactic acid pad in the same routine, each of them the best-scoring product in its own step and the three of them together a barrier injury. Whichever step ends up carrying the acid says so, and prints the entry on its list that put it there.

What we will not do is tell you a product will fix something. A position on a list is a fact; an outcome is a promise about your skin that nobody who has not seen it can make. Every step has four alternatives behind it for exactly that reason, and the acid rule does not hide them: if you want the acid toner anyway, it is in the swap list under the step, one click from being yours.