People commonly use red light therapy to help the following conditions. However, science has yet to confirm the treatment’s usefulness for:
- Seasonal affective disorder (SAD): A 2019 review determined that not enough evidence supports red light therapy as a treatment for seasonal affective disorder, a type of depression related to seasonal change.
- Weight loss: No reliable studies support any weight loss benefits of red light therapy. However, limited research shows that the treatment may help reduce waist circumference.
- Low back pain: In several controlled trials, red light therapy did not affect pain and disability in individuals with chronic, nonspecific lower back pain. Seemingly positive outcomes were based on low-quality evidence.
- To activate cancer treatments: According to a 2021 review, low-level laser light therapy may help aid cancer treatments. However, the long-term safety of its use on or near tumors hasn’t been proven.
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