 Low-level laser therapy, LLLT, is a non-invasive medical therapy that uses light energy to treat various conditions. It has been shown to reduce pain, inflammation, and swelling, promote healing of wounds, and prevent cell death and tissue damage. However, despite numerous positive experimental results, its use in mainstream medicine is still controversial due to a lack of understanding of the biochemical mechanisms involved. Recent research suggests that LLLT works by activating specific receptors in cells, which then trigger a cascade of events leading to improved cell function. Additionally, it appears that lower doses of light produce more beneficial effects than higher doses, suggesting that a biphasic dose response may be at play. This article was authored by Yingying Huang, Aaron Chien, James D. Carroll, and others.