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Therapeutic applications of light emitting diode‐red light (LED‐RL) are expanding, yet data on its clinical effects are lacking. Our goal was to evaluate the safety of high fluence LED‐RL (≥160 J/cm2). In two phase I, single‐blind, dose escalation, randomized controlled trials, healthy subjects received LED‐RL or mock irradiation to the forearm thrice weekly for 3 weeks at fluences of 160‐640 J/cm...
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