How are VDR and longevity related?

The relationship between the vitamin D receptor (VDR) and longevity is frequently discussed in popular health literature and marketed by direct-to-consumer DNA tests, but the scientific evidence is weak. VDR is a nuclear receptor that regulates gene expression in multiple tissues, including the immune system, bone metabolism, and cell cycle. Vitamin D signaling influences inflammation, oxidative stress, and telomere length—all processes linked to aging. Some observational studies have reported associations between common VDR polymorphisms (e.g., FokI, BsmI) and lifespan, but effect sizes are small, population-specific, and not consistently replicated. Mechanistic studies in cell and animal models provide plausible pathways, but human randomized controlled trials demonstrating a causal link are lacking. Therefore, the evidence is best classified as 'unclear' or 'mechanistic'. Consumers should be aware that testing VDR variants does not provide a reliable prediction of individual longevity. Proven factors such as diet, exercise, and maintaining adequate vitamin D status (measured by serum 25(OH)D) are far more relevant. The provided context documents do not mention VDR or longevity; they cover unrelated topics like PCSK9, MTHFR, cortisol, and LDL.