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American Focus > Blog > Tech and Science > Vitamin D May Slow Cells’ Aging by Protecting DNA
Tech and Science

Vitamin D May Slow Cells’ Aging by Protecting DNA

Last updated: May 21, 2025 3:35 pm
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Vitamin D May Slow Cells’ Aging by Protecting DNA
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Vitamin D has long been hailed as a wonder supplement with potential benefits for a variety of health conditions. A recent study suggests that vitamin D supplements may have the potential to slow down cellular aging by protecting telomeres, which are DNA sequences that shorten with age. However, the exact health implications of these findings are still unclear.

The study, which was published in the American Journal of Clinical Nutrition, analyzed data from the VITamin D and OmegA-3 TriaL (VITAL), a large randomized controlled trial. The researchers found that participants who took 2,000 international units of vitamin D per day showed less telomere shortening over a four-year period compared to those in the placebo group. On the other hand, fish oil supplements did not have a significant effect on telomere length.

Telomeres play a crucial role in cell division by stabilizing chromosomes. As cells divide, telomeres shorten, eventually leading to cell death. Telomere length is often used as a biomarker for aging, although very long telomeres can also increase the risk of cancer. The study participants started with an average of 8,700 base pairs of DNA telomere length, and vitamin D supplementation slowed the loss of length by about 140 base pairs over four years.

While these findings are intriguing, experts caution that the magnitude of difference seen in the study may not have a significant clinical impact for most individuals. Mary Armanios, a professor of oncology, points out that telomere length can vary widely within the normal range, and the difference observed in the study falls within this range. Additionally, the method used to measure telomere length can be sensitive to various factors, which may affect the accuracy of the results.

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It is worth noting that a study conducted in the U.K. found that very high levels of vitamin D in the blood were associated with shorter telomeres, suggesting that more is not always better. The researchers are now looking to replicate the results in a more diverse sample and are analyzing other aspects of cellular aging, such as DNA methylation.

Overall, the findings from this study provide valuable insights into the potential benefits of vitamin D supplements for certain high-risk groups. While vitamin D supplements are currently recommended for individuals aged 75 and older, as well as those with prediabetes, the researchers emphasize that it should not be a universal recommendation for everyone to take a supplement. Instead, targeted interventions for specific at-risk populations may be more beneficial in the long run.

TAGGED:agingcellsDNAProtectingSlowvitamin
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