Photobiomodulation and Biological Pathways in Skin Regeneration and Rejuvenation: Light and Biological Activation of Skin Improvement.

Photobiomodulation harnesses visible and near-infrared wavelengths to modulate mitochondrial energetics and transcriptional programs that orchestrate wound repair, immune homeostasis, angiogenesis, and organized extracellular matrix remodeling. In parallel, topical or intradermal biological interventions (including exosomes, platelet-rich plasma and platelet-rich fibrin, polydeoxyribonucleotides, polynucleotides, recombinant growth factors, and bioactive peptides) deliver molecular cargo that stimulates collagen synthesis, elastin assembly, and barrier restoration. Fractional ablative and non-ablative laser systems, along with mechanical and energy-based microneedling platforms, overcome the stratum corneum barrier to facilitate substantive dermal penetration of these agents through laser-assisted drug delivery (or device-assisted drug delivery).