Cica

• Fragrance in Skincare: What the Evidence Actually Says

  Fragrance is one of the most common causes of allergic reactions to cosmetics — but most people who use it never react. Here's how to tell if you're one of the people who should skip it.

• Heartleaf (Houttuynia Cordata): What the Science Actually Says About K-Beauty's Favorite Calming Extract

  Heartleaf shows real anti-inflammatory and antibacterial activity in lab studies, but almost all of that evidence comes from cells and mice, not people. Here's what's proven, what's plausible, and what's still marketing.

• Mugwort in K-Beauty: What the Science Actually Says About the "Soothing" Ingredient

  Mugwort shows up in K-beauty toners, creams, and sheet masks as a calming, ancestral remedy for reactive skin — but the anti-inflammatory evidence is still mostly test-tube and mouse data, not human trials. Here's what's actually been measured, and why mugwort's own plant family isn't risk-free for everyone.

• Propolis in Skincare: What the Bee-Made K-Beauty Ingredient Actually Does

  Propolis has antibacterial and antioxidant activity in lab testing, while one small exploratory acne trial produced mixed results versus benzoyl peroxide. It is also a well-documented contact allergen, so it's worth knowing what you're getting into.

• Panthenol (Vitamin B5): The Quiet Ingredient That Actually Rebuilds Your Barrier

  Panthenol converts to vitamin B5 once it's in your skin, feeding the exact lipid-building process that holds your barrier together — and unlike a lot of skincare claims, this one has real randomized trials behind it. Here's what the evidence shows, and where panthenol's job stops.

• Fermented Skincare, Honestly Explained: Galactomyces, Pitera, and Rice Ferment

  Fermentation really does break skincare ingredients into smaller, more active pieces — but almost all the star research on galactomyces ferment filtrate (the ingredient behind SK-II's Pitera) comes from the one company that owns it. Here's what the studies actually show.

Tracking 1 published papers (2026).

• A Randomized, Double-Blind, Placebo-Controlled Trial Assessing the Effects of Oral Centella asiatica Extract on Skin Aging-Related Parameters in Middle-Aged Korean Women.

  Nutrients, 2026, cited 0× (OpenAlex)

Related ingredients, common formula neighbors, naming, and catalog context. This stays separate from evidence and personal-fit guidance.