K-Beauty › Library › Evidence grades

Evidence grades — K-Beauty Library

All 16 evidence grades guides.

Azelaic Acid: what the evidence says Bakuchiol: what the evidence says Centella / Madecassoside (Cica): what the evidence says Ceramides / Barrier Repair: what the evidence says Exosomes: what the evidence says Heartleaf (Houttuynia cordata): what the evidence says Microbiome / Postbiotics: what the evidence says Niacinamide (Vitamin B3): what the evidence says PDRN (Salmon DNA): what the evidence says Peptides: what the evidence says Propolis: what the evidence says Retinol: what the evidence says Rice & Galactomyces Ferment: what the evidence says Snail Mucin: what the evidence says Sunscreen Reapplication: what the evidence says Vitamin C: what the evidence says

Explore the full K-beauty hub →

💄 K-Beauty hub 📚 All guides 🎤 K-Pop 🧭 Korea travel

✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed 2026-06-21.

General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.