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

342 ingredients

Start from a concern

News

2026.11.03NEWA Century of Beauty Research 2026.10.29AI肌診断と本人の肌悩みを統合。商品開発と継続的なスキンケアの完全連動へ 2026.10.27Retinol vs Bakuchiol: Is the "Natural Retinol" Claim Real?

Ingredient of the Day

Acetyl Octapeptide-3 (SNAP-8®)

Expression line reduction, BoNT-like, improved Argireline

Ingredients

Featured Ingredients

Ceramide NP NS AP

Barrier function repair, TEWL reduction

Niacinamide Vitamin B3

Wrinkle improvement, melanin suppression, barrier strengthening, NAD+ precursor

Vitamin A (Retinol)

Turnover promotion, collagen synthesis, wrinkle improvement

Vitamin C (Ascorbic Acid)

Antioxidant, collagen synthesis (cofactor for proline hydroxylation), melanin suppression

Moisturizing, skin softening

Sodium Hyaluronate

Holds water and forms a protective film on the surface.

Journal

Journal

Skin Longevity SeriesNEWA Century of Beauty Research2026.11.03 Skin Longevity SeriesRetinol vs Bakuchiol: Is the "Natural Retinol" Claim Real?2026.10.27 Skin Longevity SeriesThe Three Dermal Pillars — Collagen, Elastin and Hyaluronic Acid2026.10.20 Skin Longevity SeriesThe First Three Signs of Aging — Preventive Skincare from Your 30s2026.10.13 Skin Longevity SeriesDesigning Moisture in Layers — Humectant, Occlusive, Emollient2026.10.06 Skin Longevity SeriesIs PDRN (Salmon DNA) the Real Deal? Grading Regenerative Buzz Ingredients with Science2026.09.29

Skin Longevity

Don’t fight aging.

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

READ THE ESSAYS