Green Tea for Anti-Aging

Research suggests that green tea and its key polyphenol EGCG may support healthy aging through multiple biological pathways, including reducing oxidative stress, modulating inflammation, supporting cellular maintenance processes, and influencing gut microbiome composition, with narrative reviews from 2025 and earlier laboratory and animal studies generally pointing in a supportive direction. Studies indicate that in model organisms such as the roundworm C. elegans, green tea extracts and specific catechin compounds can meaningfully extend lifespan and stress resistance, with one 2024 study identifying a lesser-known subgroup of compounds that extended lifespan by up to 73% in worms, though translating such findings to humans remains an open question. Human and clinical evidence is more limited, drawing primarily from observational associations and reviews rather than large randomized controlled trials, and a 2016 cosmeceutical review cautioned that ingredient claims for topical green tea products are often supported by low-quality research, while a 2018 phytochemical review similarly noted that most anti-aging evidence for compounds like L-theanine remains indirect and preclinical. Overall, the body of evidence is promising but incomplete, and researchers consistently call for more rigorous clinical trials, better-defined aging biomarkers, and a clearer understanding of optimal use and individual variability before firm conclusions can be drawn.