The Ingredient Edit

Ingredients, explained

What the popular K-beauty ingredients actually do for skin over 40, what the research shows, and how much evidence there really is.

Retinal and retinol

The best-studied ingredients for fine lines. How they differ and how to start.

Strong evidence Niacinamide

Vitamin B3 for barrier support and dark spots.

Good evidence Centella asiatica

The calming plant extract in so many K-beauty products.

Moderate evidence Snail mucin

Why a snail secretion became a skincare staple.

Limited evidence PDRN (“salmon DNA”)

The newest trend. Hype or worth it after 40?

Early evidence

Evidence labels are our plain-English summary of how much good-quality human research exists, not a promise of results.