Why Your Skin Barrier Matters More Than Any Single Product
The skincare industry sells hundreds of products that claim to improve your skin. Most of them are trying to fix a problem that starts in the same place: a damaged barrier. The stratum corneum, the outermost layer of skin, is less than…
What Retinol Actually Does to Skin Cells, According to Published Research
Retinol is the most studied topical ingredient in dermatology, and the most misunderstood by the people who buy it. Walk into any drugstore and you will find dozens of products that name it on the label. Most of them do not tell…