Stanford physician Lucy Kalanithi athte gravesite of her neurosurgeon husband, Paul, with their daughter, Cady, five years after his death. (Photography by Timothy Archibald for Stanford Medicine magazine 2020 Issue 1)
Photobiomodulation, the use of light waves to change human biology, has boomed in recent years for all kinds of purposes, at medical clinics and at home. We wanted to know what the science says — and doesn’t say.