What Is Glass Skin, and Can Gotu Kola Help You Get It?

Glass skin has been quietly running the beauty internet for the better part of a decade, and it shows no sign of going anywhere.

The idea is simple, skin so smooth, even and well hydrated that it catches the light the way a clean pane of glass does.

The assumption underneath it is less simple, and it is the one worth questioning. Namely, that you can buy your way there with enough steps and enough bottles.

So here is the herbalist view. What glass skin actually describes, why it gets harder to hold onto as the weather turns, where gotu kola fits into the picture, and what a sensible routine looks like once you take the noise out.

So what is glass skin actually describing?

It helps to think of it as a description of light rather than a skin type. Light bounces evenly off a surface that is smooth and properly hydrated, which reads to the eye as luminous.

Skin that is dehydrated or rough at a microscopic level scatters that light in every direction instead. We call the result dullness, and it is one of the most common things people come into the shop asking about.

Worth saying plainly, since a lot of marketing muddies it. Glass skin is not the same as oily skin, and it is not a filter. Skin has pores and texture, and it is meant to.

The trend itself has matured, too. The current conversation has moved away from high shine and towards barrier strength, comfort and even texture, which is a shift we are rather pleased about.

Why does glass skin get harder from September onwards?

Cold outdoor air holds far less water than warm air, and indoor heating dries things further. Your skin sits between the two, losing moisture to the air around it through a process called transepidermal water loss.

Laboratory work on human skin models has shown that low humidity alone measurably weakens barrier function and changes how the outer layer of skin behaves¹. That is the mechanism behind the tightness most people notice in the first properly cold week of the year.

The practical consequence is straightforward. The glow that came easily in August needs a little more support by October, and a routine that worked all summer may suddenly feel like it is not quite enough.

Where does gotu kola come into it?

If you have browsed Korean skincare, you have met gotu kola already. It usually appears under its botanical name, Centella asiatica, or as cica, and it is one of the most heavily used botanicals in the category.

What tends to surprise people is how far from new it is. Gotu kola has a long history of use in Ayurvedic and traditional Chinese herbal practice, and it has sat in the Napiers dispensary for a very long time indeed.

The plant's interest for skin comes mainly from a group of compounds called triterpenoid saponins, chiefly madecassoside and asiaticoside.

What does the research on centella actually say?

A 2025 review of Centella asiatica in skin health reported that clinical studies of topical preparations have measured improvements in hydration, transepidermal water loss, elasticity and the appearance of wrinkles, alongside good tolerability on the skin².

Separate laboratory work on madecassoside specifically has looked at its effects on skin hydration and inflammatory pathways associated with blemishes³. A wider review of the plant in dermatology sets out the proposed mechanisms in more detail⁴.

It is important to note the human studies in this area are mostly small, they vary a lot in design, and they tend to test finished cosmetic formulations rather than the plant on its own.

So gotu kola is genuinely interesting and well tolerated, with a traditional reputation for skin that the early research does not contradict. 

What would a herbalist put in a glass skin routine?

Four steps, not ten. The simplification of long routines has been one of the more sensible developments in skincare recently, and your skin barrier tends to agree.

Cleanse gently, once or twice a day. If your face feels squeaky afterwards, the cleanser is too harsh. That stripped feeling is barrier disruption, not cleanliness.

Hydrate onto damp skin. A hydrosol or toning water applied while the face is still damp gives the next layer something to hold. Napiers Witch Hazel Water is a straightforward distilled option with nothing else going on in it.

Use a serum with purpose. Mornings are where brightening and hydrating ingredients earn their place, which is why our Napiers Vitamin C Serum pairs stabilised vitamin C with hyaluronic acid and gotu kola to support a brighter, more even looking complexion.

Seal it in, and wear sunscreen. A moisturiser suited to your skin locks the hydration where you want it, and daily sun protection does more for long term evenness of tone than any serum will⁵.

For the last step, a lighter botanical cream such as Napiers Phytologic Revival Day Cream suits most skins by day, while something richer works better overnight once the heating goes on.

If the ingredients side of this is what interests you, our guide to checking whether your skincare is non toxic is a useful companion piece, and we have also written about the return to traditional skincare and why most of it is not new at all.

Does anything you take internally make a difference?

Some of it, yes, though rather less dramatically than the internet suggests. Skin is built from what you eat, so the foundations matter more than any single supplement.

Vitamin C is the clearest example, since the body needs it to form collagen, and collagen is part of what keeps skin firm and structured⁶. We have gone into the detail of that in our piece on vitamin C, collagen support and how much you need.

Gotu kola is also taken internally in traditional practice, and we supply it as a Gotu Kola Tincture made in our own dispensary. It is important to note Gotu Kola tinctures can cause serious side effects, and should not be taken for extended periods always consult your GP or a qualified herbalist before adding it to your routine. This is particularly important if you are pregnant, breastfeeding, taking prescribed medication or if you have liver disease.

Our herbalists offer a free consultation if you would like to explore herbs further with a qualified medical herbalist.

What is honestly not worth your money?

Ten step routines, for most people. Every additional active is another chance to irritate skin that was doing fine.

Over exfoliating is the other one. Acids used too often will give you a brief smoothness followed by a compromised barrier, and a compromised barrier looks dull, which sends people back to the acids.

And anything promising to shrink your pores permanently. Pore size is largely genetic, although keeping them clear and the surrounding skin hydrated does make them less noticeable.

Where does that leave you?

Glass skin, stripped of the marketing, is a well hydrated and undamaged skin barrier catching the light properly. That is an achievable thing, and it is mostly a matter of consistency rather than spending.

Gotu kola deserves its place in the conversation, both for its traditional reputation and for the research now gathering behind it. It simply deserves it as one useful plant among several, not as the answer.

If you are not sure where your skin is actually struggling, that is exactly the sort of thing our herbalists are good at working out. You can book a free consultation whenever suits you.

Glass skin questions we get asked most

What is glass skin?

Glass skin describes skin that is smooth and hydrated enough to reflect light evenly, giving a clear, luminous look. It is a description of surface quality and hydration rather than a skin type or a specific product.

How do you achieve glass skin?

Focus on hydration and barrier care rather than on adding steps. Cleanse gently, apply hydrating layers onto damp skin, use a well chosen serum, seal with a moisturiser and wear sun protection daily.

Why is gotu kola considered so useful for glass skin?

Gotu kola, or Centella asiatica, contains triterpenoid saponins such as madecassoside and asiaticoside. Reviews of topical studies report measured improvements in hydration, water loss through the skin and elasticity, which is why it features so heavily in Korean skincare².

What are the best products for glass skin?

The useful ones are a gentle cleanser, a hydrating toner or hydrosol, a serum containing hydrating and brightening ingredients, a moisturiser matched to your skin and a daily sunscreen. Anything beyond that is optional rather than essential.

Is a Korean glass skin routine suitable for sensitive skin?

A long routine with many actives often is not. A shorter version built around gentle cleansing, hydration and barrier support usually suits sensitive skin far better.

How long does it take to see a difference?

Hydration changes can be visible within days, because they are largely about water in the outer layers of skin. Changes in texture and tone take longer, and eight to twelve weeks is a realistic window.

Can I use gotu kola if I am pregnant or taking medication?

Always check first. Gotu kola taken internally is not suitable for everyone, and a qualified herbalist can advise you properly. Our free consultation is the easiest way to ask.

References

1. Izutsu Matsumoto A, et al. Effect of low humidity on the barrier functions of keratinocytes in a reconstructed human epidermal model. International Journal of Cosmetic Science, 2025. Available at: https://doi.org/10.1111/ics.13048.
2. Handayani R, Febriyanti RM, Muhaimin M, Chaerunisaa AY. Centella asiatica (L.) Urb. in skin health and cosmeceuticals: mechanisms, clinical evidence, and advanced delivery systems. Pharmacia, 2025; 72: 1 to 13. 
3. Propionibacterium acnes related anti inflammation and skin hydration activities of madecassoside, a pentacyclic triterpene saponin from Centella asiatica. Bioscience, Biotechnology, and Biochemistry, 2019; 83(3): 561 to 568. 
4. Park KS. Pharmacological effects of Centella asiatica on skin diseases: evidence and possible mechanisms. Evidence Based Complementary and Alternative Medicine, 2021. 
5. NHS. Sunscreen and sun safety. 
6. NHS. Vitamins and minerals: Vitamin C.