Every good cream says peptides. She finally read the back of hers — and found the number that tells you which one you're actually paying for.

Three women in four in the USA say their face is sensitive. Most of the time it isn't sensitive skin at all -- it's cosmetic intolerance, and there's a real, free way to fix it.

The idea of good bacteria won in the kitchen. What happens when it comes up to your face — and why six species printed on a label mean more than a "probiotic complex" ever could.

Most of the wear on the skin's microbiome is done by people trying to take care of their skin. Seven habits a careful person does on purpose, what they add up to over years, and the one thing to take away before adding anything.

Caffeine shows you its work the same morning — which makes it the one active you can actually get better at. The four variables worth testing, and a four-week way to find yours.

Search "under eye brightener" and you get two different products that do opposite jobs. Here's what separates them — and how the concealer already in your bag tells you which active your under-eyes actually need.

Every hyaluronic acid writes the same on an ingredient list — which is exactly why quality is invisible. The three things that separate one material from another, and how to judge a jar without the label's help.

Growth factors are among the most expensive ingredients in skincare — and almost no eye cream has one. What EGF and FGF are, why brands skip them, and how to check a label in ten seconds.