In the rapidly evolving field of therapeutic gas research, molecular hydrogen has emerged as a subject of intense scientific scrutiny. As we move deeper into 2025, the volume and quality of studies on molecular hydrogen inhalation have expanded significantly, offering new insights into its potential benefits, mechanisms of action, and clinical applications. This article synthesizes the latest research on molecular hydrogen inhalation published in 2025, drawing from peer-reviewed journals, clinical trials, and preclinical studies to provide a comprehensive overview of what the current evidence reveals.