Red nail theory this and red car theory that—there’s no denying the color is having a moment, but the power of a red lipstick ...

Made from petroleum, red dye 40 is a synthetic food dye. Some studies suggest a link between red dye 40 and ADHD behavior; the dye might trigger or exacerbate behavioral changes in sensitive children.

The star appeared to channel specific scenes from the infamous 1999 music video, that sees the hitmaker showing off her moves in a glittering Y2K jungle-meets-club aesthetic. In the video ...