Cosmetic Science Library

Answering the “why” of
cosmetics, with science.

A library where you learn cosmetic science. Aiming to be the definitive cosmetic-science library.

Explore the Library

328 ingredients

Start from a concern

News

2026.07.20Skincare brand EVOLURE launches today 2026.06.19AI Skin Diagnosis adds product recommendations

Ingredient of the Day

Anti-glycation, antioxidant

Ingredients

Featured Ingredients

Ceramide NP NS AP

Barrier function repair, TEWL reduction

Niacinamide Vitamin B3

Wrinkle improvement, melanin suppression, barrier strengthen

Vitamin A (Retinol)

Turnover promotion, collagen synthesis, wrinkle improvement

Vitamin C (Ascorbic Acid)

Antioxidant, collagen synthesis (cofactor for proline hydrox

Panthenol Pro-Vitamin B5

Moisturizing, barrier repair, anti-inflammatory

An amino acid that replenishes the natural moisturizing fact

Journal

Journal

Skin-Concern SolutionsFor Those Whose Skin Stays Dry No Matter What They Apply -- What You're Missing Isn't Moisture Skin-Concern SolutionsWhy Your Skin Gets Dry Even in Summer -- The Science Behind Why Sweating Doesn't Mean Hydration Skin-Concern SolutionsFor Those Who Feel Cream Alone Isn't Enough -- What Needs to Happen Before You "Seal"Skin-Concern SolutionsFor Those with Sensitive Skin Who Can't Use Anything -- Understanding What "Irritation" Really Means Skin-Concern SolutionsThe Real Cause of Recurring Breakouts -- Why "Keeping Clean" Isn't Enough Skin-Concern SolutionsFor Those Who Can't Feel Their Aging Skin Recovering -- The "Foundation" Your Skin Needs

Skin Longevity

Don’t fight aging.

KAIAN’s way of rethinking the relationship between skin and time.

READ THE ESSAYS