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Sergej Ostojic is a physician and nutrition scientist whose work focuses on human bioenergetics, mitochondrial function, and clinically relevant applications of nutritional interventions in heath and disease. He has authored more than 350 scientific publications, led multiple international clinical trials, and contributed to advancing understanding of conditionally essential nutrients across the lifespan. His research integrates molecular biomarkers, metabolic profiling, and population-based analyses to inform precision nutrition strategies. In addition to his academic roles, he is founding Editor-in-Chief of Clinical Bioenergetics and actively collaborates with industry partners to translate laboratory findings into innovative functional-nutrition solutions.