Figure 1.

Photobiomodulation concerns the transformation of photophysical energy contained in visible and (near)-infrared light into chemical energy. It activates the primordial photoacceptive properties of some molecules naturally involved in the metabolism and physiology of animal/human cells. When activated, these primary light targets influence cell homeostasis. Photobiomodulation can moderate a cell’s responses and influence mesenchymal/stromal cell proliferation, differentiation and its secretome (figure created with BioRender.com).