Almost everyone has one — the eye that photographs better, the side where mascara behaves, the lash line that holds a curl while the other collapses. It gets blamed on...

Ask most people when they bought their current mascara and you’ll get a pause, then a guess, then a defensive “maybe last spring?”. The three-month rule gets repeated often and...

Most formulations are described by what they contain. This one is just as defined by what it leaves out. A cosmetic chemist walks through the three peptides in QUA-X BioSignal...