
09/23/2025
A new study just found that people taking vitamin D3 (2,000 IU a day) kept their telomeres—those protective caps on your DNA—longer over four years compared to those on a placebo.
Why does that matter?
Telomeres naturally shorten as we age, and shorter telomeres are linked to things like chronic inflammation, weaker immunity, and higher disease risk. In this study, vitamin D users had telomeres that looked almost three years “younger” than the non-vitamin D group.
We already know vitamin D helps with immunity, mood, and bone health, but this research suggests it may also slow one of the body’s fundamental aging processes.