Glass Skin? Why your glow needs three layers

Glass Skin comes from Korean skincare. It refers to a complexion that looks hydrated, smooth, and clear all at once. For skin to look this way, three things need to be in place. The upper layers need enough water to look plump. The skin’s surface needs to renew regularly to stay smooth and even. And the cells need energy to keep doing this over the years. If any one of these layers is missing, skin can quickly look dull, even when you take good care of it.

Most Glass Skin products only deliver the first layer. They look great right after application, but the effect lasts only as long as the moisture stays in your skin. By the next day at the latest, it has often disappeared. For a glow that lasts, your skin needs all three layers. That’s the idea behind longevity skincare, which we explain in our article Anti-Aging or Longevity.

Hyaluronic acid is the active ingredient behind the typical Glass Skin effect. The molecule binds a lot of water and plumps the skin from within. This makes fine lines look less deep, while the surface reflects light more evenly.

What matters here is the size of the molecules. In a study of 76 women aged 30 to 60, researchers tested hyaluronic acid in five different sizes over 60 days. All variations significantly improved the skin’s hydration and elasticity. The smaller molecules also reduced wrinkle depth, presumably because they penetrate deeper into the skin (Pavicic et al., 2011).

That’s why our mask contains six forms of hyaluronic acid. Large molecules form a film on the skin and lock in moisture at the surface. Small molecules work deeper down and plump the skin there. This gives your skin hydration on several levels at once, and the Glass Skin glow appears as soon as you remove the mask. Afterwards, your skin feels soft and plump, without any greasy film.

Retinal is a form of vitamin A and the strongest one available without a prescription. The skin converts vitamin A into its active form, retinoic acid. Retinol takes two steps to do this, while retinal takes only one (Mambwe et al., 2025). That’s why it works more directly.

Retinal stimulates skin renewal. In a long-term study, 0.05 percent retinal thickened the epidermis and improved elasticity after one year (Mambwe et al., 2025). In another study, fine lines and roughness were measurably reduced after 18 weeks, and retinal irritated the skin significantly less than prescription retinoic acid (Creidi et al., 1998).

For Glass Skin, that means a finer, more even-looking complexion. The smoother the surface, the more evenly it reflects light. Read about exactly how retinal works and how it differs from retinol in our article Retinal Instead of Retinol.

NAD+ is the molecule every cell uses to produce energy. Enzymes also need it to repair genetic information (Covarrubias et al., 2021). NAD+ levels in tissues decline with age, which is why it’s considered one of the most exciting approaches in longevity research.

This is particularly interesting for the skin. In 2024, a research team showed that NAD+ applied externally can protect human skin cells from UV stress (Kang et al., 2024). The precursor niacinamide has also been well studied. After twelve weeks, fine lines, spots, and dull skin tone improved (Bissett et al., 2004).

For your glow, this means your cells have enough energy to do their job. Renewal and repair take energy. NAD+ works right where Skin Longevity begins. That’s why we believe this molecule belongs in any skincare routine that goes beyond quick results. Find out more in our article on NAD+ benefits.

Each active ingredient is powerful on its own. Together, they add up to more than the sum of their parts, because each has a different role. Hyaluronic acid delivers the immediate effect you can see in the mirror. Retinal works over several weeks to refine the look of your skin. NAD+ gives your cells the energy they need for this renewal.

There’s also a practical benefit. Vitamin A can initially irritate sensitive skin. Hyaluronic acid helps keep skin hydrated, while Centella Asiatica soothes it further. This plant has long been used in cosmetics and helps support regeneration and calm redness (Bylka et al., 2013). That way, you get the power of retinal with a feel-good sensation for your skin. This combination is especially beneficial if you’re new to vitamin A, as it gives your skin time to adjust.

That’s exactly what sets longevity skincare apart from traditional anti-aging. It’s not about smoothing individual wrinkles, but strengthening the skin at every level. Our article on skin aging explains why most people take the wrong approach.

Our LONGEVITY SKIN GLOW MASK combines all three layers in one application, along with Centella Asiatica. Two years of development went into this formula. We created it to deliver benefits you can see right away and enjoy over time. The first edition is limited to 500 units.

How to use the mask.

• Apply in the evening. Apply an even layer to cleansed skin, avoiding the eye area.
• Leave it on. The mask sits in full contact with the skin, without slipping like a sheet mask.
• Peel it off. Instead of rinsing it off, simply peel it away and see the glass skin glow right away.
• Use twice. The syringe contains enough for two applications and can be hygienically resealed.
• Use sunscreen in the morning. Skin treated with retinal is more sensitive to light. Daily sun protection has also been shown to slow skin aging (Hughes et al., 2013).

Glass skin is more than a layer of moisture. Lasting glow takes three levels: hyaluronic acid for plump skin, retinal for a finer-looking complexion, and NAD+ for cellular energy. Each active ingredient is well researched, and together they make the difference.

The LONGEVITY SKIN GLOW MASK combines all three in one application. It gives you an immediate glow and continues working on your skin with every use. To us, this is the future of glow, which we approach from the inside and out with our full range.