A dermatologist snuck red LED panels into his son's hospital room after a stroke, and now he's a convert

Red-light therapy devices are showing up in dermatology offices, locker rooms, and homes, propelled by a market projected to top $1 billion by 2030. Most of the consumer hype is noise. But a growing stack of clinical evidence is catching up to the marketing, and a new Nature feature digs into what researchers actually know about how and why shining certain wavelengths of light on the body produces measurable biological effects. — Read the rest

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