Light therapy review finds benefits for selected outcomes, with limited certainty
An umbrella review of randomized trials found improvements in selected symptoms and functions with photobiomodulation, a form of light therapy. Confidence in the evidence varied across conditions and outcomes.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The review found moderate-certainty evidence for less pain in burning mouth syndrome, less disability in knee osteoarthritis, less fatigue in fibromyalgia, greater hair density in androgenetic alopecia, and better cognitive function. Most other outcomes had low or very low certainty. The results concern specific outcomes and do not establish reliable improvements across all conditions examined.
Results varied between studies, and some outcomes showed possible publication bias. The abstract does not provide treatment schedules, comparator details or assessment timing needed to interpret individual effects.
Different outcomes, different evidence
The review assessed particular outcomes within particular conditions. Less fatigue in fibromyalgia and greater hair density in androgenetic alopecia are separate findings; neither result establishes improvements in unrelated symptoms or overall health.
What evidence certainty means
Evidence certainty describes confidence in a result, rather than the size of an improvement. The authors identified inconsistent study results and possible effects of small studies, and called for better trials and more consistent treatment protocols.
The original publication
Effects of photobiomodulation on multiple health outcomes: an umbrella review of randomized clinical trials.
Son Y, Lee H, Yu S et al.
Syst Rev · 2025
- PubMed ID
- 40770824
- Record checked
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