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Stanford Medicine

Julia Salzman, Ph.D., rides her bike on campus near the Arizona Cactus Garden at Stanford University, on Friday, Feb. 16, 2024, in Stanford, Calif. (Photo by Jim Gensheimer)

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Aging & Geriatrics

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.