If you are considering red light therapy, it is completely natural to ask: Is it safe? You may have seen dramatic claims online - both positive and negative. So it helps to step back and look at it calmly and realistically. Red light therapy, when used correctly, is generally considered safe and non-invasive. Red Light Therapy commonly used at home to support joint pain, arthritis and muscle discomfort. But like any health-related tool, it should be used sensibly.