In vitro impact of laser irradiation on platelet aggregation.

What the authors concluded

Low laser irradiation induced significant changes in platelet aggregation in the presence of weak agonists such as adenosine diphosphate (ADP) (P ≤ 0.05) and epinephrine (P ≤ 0.01). Low-level laser therapy has no influence on platelet count; however, it promotes platelet aggregation in response to weak agonists, specifically ADP and epinephrine.