Below are links to a few current Meta- analysis research reviews on the benefits of LLLT
https://www.painphysicianjournal.com/current/pdf?article=NjMwNA%3D%3D&journal=120
https://link.springer.com/article/10.1007/s10103-020-03124-w
https://www.sciencedirect.com/science/article/abs/pii/S1871402119304394
https://bmjopen.bmj.com/content/bmjopen/9/10/e031142.full.pdf