A recent study published in May 2025 indicates that vitamin D3 supplements may help slow down biological aging. Researchers from the VITAL (VITamin D and OmegA-3 TriaL) study found that participants taking vitamin D3 experienced less telomere shortening, equivalent to almost three years of delayed aging compared to the placebo group.
The study, which tracked over 1,000 adults for four years, assessed the impact of vitamin D3 and omega-3 fatty acid supplementation on telomere length in white blood cells. Telomeres are protective caps on chromosomes that shorten with age and are associated with age-related diseases.
The findings suggest that daily vitamin D3 supplementation could be a promising strategy to counter biological aging. Experts recommend consulting healthcare professionals for appropriate dosage, as excessive vitamin D intake can lead to health complications. The recommended daily amount of vitamin D is 400-800 IU, but some may safely consume up to 4,000 IU daily.