CYP2C19 is a cytochrome P450 enzyme primarily involved in metabolizing drugs like clopidogrel, proton pump inhibitors, and certain antidepressants. For longevity in the sense of healthy aging, there is no strong direct evidence. Genetic variants (e.g., *2, *3, *17) alter enzyme activity – poor metabolizers face reduced efficacy of clopidogrel, which can be relevant for cardiovascular patients. Indirectly, optimized medication may support cardiovascular health, but a direct longevity benefit is unproven. Evidence comes from pharmacogenetic studies (human-moderate) and mechanistic data. For healthy individuals not taking affected drugs, the utility for longevity is minimal. Genetic testing may be useful when planning therapy with these drugs, but not as a general longevity marker.
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