#Telomere

A landmark randomized trial suggests that vitamin D supplements may slow a key aging process by protecting telomeres, the protective caps at the ends of chromosomes. In a sub-study of a large U.S. clinical trial, participants who took vitamin D3 at 2,000 IU per day showed less shortening of telomeres over four years compared with those given a placebo. The finding implies that vitamin D could help delay certain aging-related changes at the cellular level, although researchers caution that more research is needed to confirm long-term benefits and to understand who might benefit most. By contrast, a similar omega-3 fatty acid supplementation showed no significant effect on telomere length in the same study.