Researchers from a large-scale randomized trial found that vitamin D supplements can help maintain telomeres, which are protective caps at the ends of chromosomes. The study, published in The American Journal of Clinical Nutrition, suggests that vitamin D supplementation may be a promising strategy to counter biological aging. Compared to taking placebo, vitamin D3 supplements significantly reduced telomere shortening over four years, preventing the equivalent of nearly three years of aging.
Source: https://medicalxpress.com/news/2025-05-vitamin-d-supplements-telomere-shortening.html