Evidence is building that red light can help conditions as diverse as hair loss, macular degeneration and mouth ulcers. And there have been striking early results in animal models of psychiatric and neurological diseases. What’s still unclear is how it works. Some scientists suggest that it’s linked to the fact that people are exposed to less natural red light than ever before. “We’re literally being starved of something that, biologically, we’ve evolved to receive,” says dermatologist David Ozog. Evolutionary biologist Elke Buschbeck’s advice is: go outside.
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