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Daily 2,000 IU Vitamin D Cuts Cancer, Autoimmune Risks

10/9/2025

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Summary

Story summary

In 1,031 participants aged 65 over four years, daily 2,000 IU vitamin D reduced telomere loss by 140 base pairs.
Telomeres protect DNA during cell division; shorter telomeres link to cancer and heart disease.
The study notes 17% fewer advanced cancers and 22% fewer autoimmune diseases; the 2,000 IU dose exceeds National Institutes of Health's 600–800 IU recommendation.

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Story summary

In 1,031 participants aged 65 over four years, daily 2,000 IU vitamin D reduced telomere loss by 140 base pairs.
Telomeres protect DNA during cell division; shorter telomeres link to cancer and heart disease.
The study notes 17% fewer advanced cancers and 22% fewer autoimmune diseases; the 2,000 IU dose exceeds National Institutes of Health's 600–800 IU recommendation.