The following submission statement was provided by /u/lughnasadh:

Submission Statement

The downside to this is that no one is sure what the mechanism is, and they also don't know how long the effect lasts. Clearly, if this is to become a useful therapy then answers will be needed there.

Low-level laser therapy is a field of medicine with some controversy. It's currently being used in many applications where some people feel there is inadequate evidence for its uses. Still, this research seems to suggest there may be future useful applications for it.

Please reply to OP's comment here: https://old.reddit.com/r/Futurology/comments/zbmall/researchers_claim_a_human_trial_with_90_people/iyrvj08/