This article is a part of CNN Underscored’s Guide to Age-Defying Beauty, a weeklong focus on the essential products, tips and tricks to enhance your glow at any age. We’ll be featuring editor-tested ...

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Red light therapy was first tested back in the mid-1960s, when a Hungarian physician named Endre Mester shined a low-power laser on the shaved skin of a mouse. Though he was testing for impacts on ...

LED therapy masks use specific light wavelengths for at-home skincare treatments. Red light is used to improve fine lines, while blue light targets acne-causing bacteria. Users should follow safety ...