It did not improve muscle cells’ energy-making function in a study of 12 people, measured 30 minutes after treatment. The study tested a key claim about Red Light Therapy: that light helps cells produce energy. Earlier test-tube work supported this idea. Luc van Loon’s team at the University of Maastricht tested it in humans. Outside reported the findings, published in Medicine and Science in Sports and Exercise. Each person received three five-minute light treatments on one leg. The team used a K-Laser Cube Plus 30 device. The other leg received three matching treatments with the light switched off. This let researchers compare treated and untreated legs in the same person. Researchers took small muscle and skin samples 30 minutes after treatment. They checked how well the cells’ energy-making parts worked. They also checked the activity of genes involved in muscle energy use. There was no difference between legs on those measures. The only difference reported was slight warming at the skin’s surface. That challenges the promise of an immediate boost in muscle energy production. It does not settle every claim about this practice. This was a small study using one device and one treatment schedule. It also does not answer whether longer use changes recovery or skin health. For BioSocial members, the useful takeaway is to separate feelings from measured changes. Session length, device details, and soreness ratings can give community comparisons more context. If you track Recovery Score, that offers another record of your own numbers. But it cannot show whether muscle cells are making energy differently. This study tested tissue samples, not wearable scores. What changes, or lack of changes, have you recorded alongside your sessions?