Whilst there is evidence that laser light can stimulate hair growth at some wavelengths, the biological mechanism by which it occurs has not been defined and clinical data from large scale, placebo controlled trials is lacking (208-210)
Nordio, M., Basciani, S., & Camajani, E
Every week
2.4 mg was the dose advanced into Phase 3 because the efficacy/tolerability ratio peaked there
Anti-inflammatory effects prevent the excessive inflammation that often stalls healing in chronic wounds
It also has been linked to influencing other growth pathways, like increasing gene expression for repair and even modulating neurotransmitter systems (dopamine, serotonin, etc., in brain injury models)