NAD+ sounds like the next big thing - but much of its benefit likely comes from niacinamide. An honest look at the trend ingredient.

The eye area is about a quarter as thick as the rest of your face. Here's how to adjust retinal amount, distance and frequency accordingly.  

Toner pads with AHA or BHA are everywhere right now - convenient, individually packaged, quick to use. The packaging often says "safe for daily use," but with acne-prone or sensitive skin, it's fair to wonder...

PA++++, SPF50 - what do the symbols on Korean sunscreen actually mean? Here's how the PA system compares to the European UVA seal.

Double cleansing every night - necessary or overkill? Here's when combination skin actually needs it, and when one cleanse is enough.

Using niacinamide and vitamin C together? The old myth comes from a 1960s lab experiment - it has nothing to do with your actual routine.

Mild tightness is normal, burning isn't. Here's how to introduce retinal safely on sensitive skin - and know when to pause.

If you have sensitive skin, "just try retinal and see how it goes" is not good advice - and you already know it. What you actually need is a way to tell a normal adjustment...

We put this month's most-hyped K-Beauty drops to the test — a PDRN peptide serum, an azelaic acid ampoule and an NAD+ booster. Here's what actually lived up to the buzz.