K‑Beauty Ingredients Glossary: From Snail Mucin to PDRN 

Snail Mucin: Regenerative All‑Rounder 

The science:

Snail Mucin (Snail Secretion Filtrate) is naturally enriched with Glycoproteins, Hyaluronic acid, Peptides, Enzymes, and Allantoin, which work together to support hydration and surface renewal. Its water-binding molecules allow skin to maintain moisture while improving elasticity and softness. 

Key benefits:

Helps smooth the look of fine, dehydration lines 

Supports a more elastic, plump appearance 

Encourages gentle resurfacing for clearer texture 

Creates a glowy cushion under foundation or Korean makeup 

Ethical sourcing 

Modern K‑Beauty brands use non‑lethal, stress-free harvesting, where snails freely roam mesh surfaces to produce Mucin naturally. Making it good for your skin - and the snails too. 

Where to use it: 

It’s most effective layered early in your routine through hydrating Essences & serums, such as: 

→ Snail mucin serum from Beauty of Joseon  

→ Snail‑infused essence from COSRX  

PDRN & Polynucleotides - The “Salmon DNA” Innovators 

Biocompatibility

PDRN (polydeoxyribonucleotide) and Polynucleotides are DNA fragments known for their excellent compatibility with the skin’s natural repair processes. They help reinforce the look of elasticity and support the skin’s calm, even-toned appearance. We’re eating them up. 

A2A receptor pathway 

These DNA fragments are associated with activating the A2A adenosine receptor, a pathway linked to soothing, replenishment and visibly improved skin texture. Getting glass skin has never been smoother. 

PDRN vs PN 

PDRN - shorter chains for lightweight, rapid support 

PN - longer chains associated with helping the skin appear firmer and bouncier 

Where to use it: 

Look out for them in targeted Serums, such as: 

→ PDRN Peptide serum from Medicube  

→ Polynucleotide Hyaluronic Acid serum from ANUA 

Panax Ginseng - The Metabolic Skin Booster 

Antioxidant power

Ginseng is packed with Ginsenosides, known for supporting overall clarity and vitality. It helps neutralise environmental stressors, contributing to a more energised-looking complexion. Adding this to your routine is always a bright idea! 

Firming & energising benefits 

With regular use, Ginseng supports the appearance of improved elasticity and radiance - especially useful in morning routines (when we need it most) or under ultra-light Korean makeup bases. 

Where to use it: 

Centella Asiatica (Cica) - Sensitive Skin’s Best Friend 

Triterpenoids 

Centella’s hero compounds - Madecassoside, Asiaticoside, Asiatic acid and Madecassic acid - are known for their soothing and protective qualities. Sensitive skin types rejoice! 

Collagen & calming benefits 

Centella supports a calmer, more balanced appearance and is ideal for sensitive, red or stressed skin. It gently reinforces barrier health while providing weightless hydration. Win, win. 

Where to use it: 

Look for Cica in replenishing Serums or gel‑creams: 

→ Cica Centella serum from SKIN1004

Mugwort & Fermented Ingredients - Bioavailable Nutrition

Galactomyces (Fermented Skincare) 

Fermentation breaks ingredients into smaller, more absorbable molecules. Galactomyces is widely used for improving radiance, balancing oil and refining texture - perfect for dull or dehydrated days. 

Mugwort (Ssuk) 

A mineral‑rich herb used in traditional Korean medicine. Mugwort helps calm visible redness, soothe irritation and support the skin’s natural defences - a fave for sensitive, reactive or combination skin. 

Where to use them: 

These botanicals shine in watery Essences: 

→ Fermented essence from Mixsoon 

→ Mugwort cleanser from AXIS-Y 

Propolis & Bee Venom - Nature’s Antibacterial Duo 

Propolis

Bee Venom

Botanical Brighteners & Hydrators 

Liquorice Root - Gentle Pigment Regulation 

Liquorice Root contains Glabridin and Liquiritin, two compounds known for helping reduce the visual effects of dark spots and uneven tone while remaining gentle enough for daily use. We’re all for them. 
Where to use it: 

→ Liquorice Root-intensive brightening serum from TIR TIR  

Heartleaf (Houttuynia) - Balancing & Soothing 

Heartleaf is loved for bringing down visible redness, balancing oil, and calming reactive skin - ideal for blemish-prone or easily irritated complexions. Got a skin SOS? This is your go-to. 

Where to use it: 

→ Heartleaf toner from Anua within Essences & Toners 

Yuza & Tremella - Glow & Hydration 

Yuza brings antioxidant-rich vitamin C benefits for brightness, while Tremella Mushroom excels at attracting and retaining moisture, helping skin feel plump and cushioned. Cloud skin here we come. 

Where to use them: 

→ Yuza serum from Erborian within Serums 

Essential Barrier‑First Actives 

Niacinamide - Multi-Corrective Support 

Niacinamide helps support tone, control oil, smooth pores and strengthen the skin’s moisture barrier - making it a must-have addition to every K‑Beauty routine. 

Ceramides (3:1:1 Ratio) - Barrier & Moisture Balance 

Ceramides, Cholesterol and Fatty Acids form the Lipid matrix that keeps moisture sealed in. The 3:1:1 ratio mirrors the skin’s natural structure, making Ceramides essential for restoring a resilient, hydrated complexion.  

Adenosine - Surface Smoothing 

Adenosine supports a smoother, more refined surface appearance, making it a hero in many night creams and restorative formulas. Dreamy skin awaits. 

Where to use them: 

Barrier‑focused Moisturisers often feature these actives: 

→ Ceramide moisturiser from Dr Jart  

→ Barrier repair cream from Tatcha  

How to Build a Regenerative K‑Beauty Routine 

Cleanse → Hydrate → Treat → Strengthen → Moisturise → Protect 

- Cleanse with a gentle low‑pH Cleanser 

- Hydrate using a fluid Essence (Snail Mucin, Mugwort, fermented ingredients) 

- Treat with a targeted Serum (PDRN, Cica, Ginseng, Propolis) 

- Strengthen using Niacinamide 

- Moisturise with a Ceramide‑rich Moisturiser 

- Protect with lightweight Korean SPF 

This layering method keeps skin hydrated, supported and ready for makeup - or to be confidently bare. 

By Sephora UK Skincare Editorial Team

Writers and experts

Updated: 19 March 2026