Literature ReviewProgress in the Application of Molecular Hydrogen in Medical Skin CosmetologyMHID-2276724PMID: 400610442025Clinical, Cosmetic and Investigational DermatologyNan Guo, Yating ZhangMolecular hydrogen is a colorless, tasteless, biologically active small-molecule gas with reducing properties, demonstrating therapeutic and preventive effects across various human systems. Its mechanisms of action include selective antioxidation, anti- inflammatory effects, apoptosis inhibition, and the regulation of gene expression and signaling pathways. In the skin, molecular hydrogen reduces