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Evidence by condition
Organised by what you want to fix, not by what someone wants to sell you.
Wrinkles and collagen
moderate evidence
Red light at 633 nm and near-infrared at 830 nm produce small but measurable improvements in fine lines, skin texture and collagen density in controlled trials. Effects appear after 8–12 weeks of consistent use and are modest — visible in measurement, subtle in the mirror.
Acne
moderate evidence
Blue light near 415 nm is antibacterial against Cutibacterium acnes and reduces inflammatory lesions in controlled trials. The evidence is weaker than for topical or oral prescription treatment, and most consumer masks emit 460–470 nm rather than the 415 nm the trials used.
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