Researchers found that vitamin D supplements helped preserve telomere length—a marker of aging—but experts say lifestyle and context matter more.
Every morning, millions of people take a vitamin D supplement, thinking mostly about stronger bones and a healthier immune system. However, quietly, at the cellular level, something else may be happening—something that could change how we think about aging.
A long-running study recently found that people who took daily vitamin D supplements for four years had slightly less shortening of their telomeres—a marker linked to cellular aging—than those who didn’t.
While experts caution that the real-world health benefits remain unclear, the findings could shed light on the protective effects of vitamin D on specific aging-related diseases, the study authors noted.
A Small but Significant Finding
The study, known as the VITamin D and OmegA-3 TriaL (VITAL), showed that people taking 2,000 IUs of vitamin D lost about 140 fewer base pairs from their telomeres than those taking a placebo—a small but statistically significant difference.
Telomeres are regions of DNA at the ends of chromosomes that naturally shorten with age. Shorter telomeres have been linked to health risks like heart disease and Alzheimer’s disease.
The study findings suggest a promising role for vitamin D in slowing a pathway for biological aging and age-related chronic disease, Dr. JoAnn Manson, the study’s coauthor and a professor of medicine at Harvard Medical School, said in an email to The Epoch Times.
Although the results are encouraging, Manson says more research is needed. “Replication of these results in another randomized trial will be important before changing general guidelines for vitamin D intake.”
The Reality Check
Participants in the study started out with an average of 8,700 base pairs. Independent experts say the difference in loss of base pairs observed in the study is very small and falls within the range of normal fluctuation, meaning it may not translate into measurable real-world benefits.
“This 140-base-pair difference is like saying your hemoglobin went from 13.0 to 13.1,” said Dr. Mary Armanios, a professor of oncology and director of the Telomere Center at Johns Hopkins University. “It trends in the right direction, but it doesn’t carry clinical meaning.”
“It is only at the extremes that telomere length matters in aging,” she added.
