Scientists Just Proved This Vitamin Slows Biological Aging by 3 Years
Are You Taking It?
Every year researchers publish thousands of papers on supplements. Most of them go nowhere. The supplement works in mice, fails in humans, or produces results too small to matter. So when a large, long-term, randomized controlled trial at Harvard comes back with a clear result on biological aging, it is worth paying attention.
In May 2025, researchers at Harvard-affiliated Brigham and Women’s Hospital and the Medical College of Georgia published results from the VITAL trial, one of the largest and longest vitamin D studies ever run. They followed over 1,000 people for four years and measured something specific: telomere length. Telomeres are the protective caps at the ends of your chromosomes. Every time a cell divides, they get a little shorter. Shorter telomeres mean faster biological aging. Longer telomeres mean the opposite.
People taking vitamin D3 daily preserved significantly more telomere length than the placebo group. The researchers calculated the difference: people taking D3 aged roughly three years slower than the placebo group over the course of the trial.
In the paid section you’ll learn:
Why your doctor’s “normal” vitamin D range is not the longevity target, and what level to actually aim for
How vitamin D controls over 200 genes and what happens to them when you are deficient
What you absolutely must stack vitamin D3 with
The full protocol: what form to take, how much, what to pair it with, and how to test your levels
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