You may have seen them on Instagram: featureless, eerie white masks glowing brightly in selfies by Jessica Alba, Kate Hudson, Chrissy Teigen, or even soccer player Paul Pogba.
The strange device dispenses the latest cutting-edge anti-aging regimen: LLLT, or low-level light therapy. The masks are studded with light-emitting diodes that pulse or flash in preprogrammed patterns of red, blue, and infrared light. Devotees swear that they are an electrical fountain of youth.
