Evidence Written about LLLT:

Over 6000 papers written, 800 RCT trials, 5000 laboratory studies have been published in many of the leading journals including The Lancet, BMJ, American College of Physicians, international association of Study of Pain, NATURE, PNAS, American Physical Therapy Association, World Health Organisation, Harvard School of Engineering and Applied Sciences, Brigham Young University and many more. Approx 40 more papers are published monthly.

to see more evidence check out www.thorphotobiomodulation.com

or if conducting your own search be aware that the therapy has a variety of names; LLLT, Low Level Laser Therapy, PBM, photobiomodulation.  Also check the dates of the research. Recent research is more relevant. Eg 2017 to 2019.