David Sinclair

Professor of Genetics

Harvard Medical School

David Sinclair is a Professor of Genetics at Harvard Medical School and a prominent aging researcher who studies the molecular mechanisms of longevity, with a focus on NAD+ metabolism, sirtuins, epigenetic aging clocks, and interventions to extend healthspan.

Mechanism of action

Sinclair's research centers on sirtuins—a family of NAD+-dependent deacetylases implicated in cellular stress resistance and lifespan regulation. His work explores how NAD+ levels decline with age and how boosting NAD+ availability may restore sirtuin function and delay aging. His lab has developed epigenetic aging clocks that measure biological age based on DNA methylation patterns, providing tools to assess the efficacy of longevity interventions. The theoretical basis involves the idea that aging is partly a loss of epigenetic information and that some aging processes may be reversible through epigenetic reprogramming.

Evidence overview

Sinclair has published extensively on sirtuins and NAD+ biology; his h-index of 114 reflects substantial citation and influence in the aging field. His foundational work on sirtuins and lifespan in yeast and model organisms has been influential in shaping hypothesis-driven research on aging and metabolism. His more recent work on epigenetic aging clocks has contributed to the development of biomarkers for aging rate. However, note that the pipeline-based evidence for specific claims attributed to his research is not yet available in this system. Much of his work involves animal models and mechanistic studies; human clinical trials validating his proposed interventions remain limited, and long-term safety and efficacy data in humans are ongoing. Some findings, particularly regarding NAD+ boosters, show mixed results in recent human studies, suggesting that animal model findings do not always translate directly.