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Megan-Mahoney-as-a-little-girl-in-Ohio

Stanford physician Megan Mahoney, MD, as a girl growing up in Columbus, Ohio. Courtesy of Mahoney

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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.