The ingredient library

What actually works, explained.

Every active worth knowing — what it does, what concentration matters, what to layer it with, and where Korean formulators get it right.

01Coming soon
BRIGHTENING WHAT IS VITAMIN C?
Brightening
Guide

What is Vitamin C?

Ascorbic acid vs. ethyl ascorbic vs. THD — the three you should know.

Research in progress
02Coming soon
ANTI-AGING WHAT IS RETINOL?
Anti-aging
Guide

What is Retinol?

How retinol works, why it stings, and how to start without wrecking your barrier.

Research in progress
03Coming soon
HEALING WHAT IS PDRN?
Healing
Guide

What is PDRN?

Polynucleotides explained — the K-beauty active everyone is talking about.

Research in progress
04Coming soon
CALMING AZELAIC ACID EXPLAINED.
Calming
Guide

Azelaic Acid explained.

For redness, rosacea, and bacterial acne. Plus the Korean brands doing it best.

Research in progress
05Coming soon
FIRMING DOES COLLAGEN ACTUALLY WORK?
Firming
Guide

Does collagen actually work?

Molecular weight, hydrolyzed vs. native, and what penetrates skin.

Research in progress
Your shelf, edited

The useful answer is usually on the label.

Start with the active you are curious about, then see which Korean formulas contain a meaningful amount of it.

Browse ingredientsHow we review