The Kleresca® PBM technology has been clinically tested. No serious side effects have been seen in clinical trials. Only few transient side effects have been reported and registered: redness, bronzing, light swelling of the skin, bleaching of hair. The side effects caused no interruption of treatment and required no clinical intervention. All registered side effects proved to be non-permanent, usually lasting from a few hours to a few weeks. On this basis, studies conclude that the Kleresca® biophotonic treatments offer high efficacy and safety.