Key Takeaways
- Personalised vitamin D dosing based on blood levels reduced recurrent heart attack risk by 52%
- Over 85% of heart disease patients had suboptimal vitamin D levels
- Researchers recommend monitoring and adjusting vitamin D every 3 months
A groundbreaking clinical trial reveals that tailoring vitamin D supplementation to individual blood levels can dramatically reduce heart attack risk in cardiac patients by over half.
Scientists found moving away from uniform “one-size-fits-all” dosing to personalised vitamin D regimens could transform heart disease management.
Study Details and Methodology
The six-year clinical trial followed 630 adults with acute heart disease at Intermountain Medical Center in Utah. Nearly half of participants had previous heart attack history.
Remarkably, over 85% of patients initially showed suboptimal vitamin D levels below 40 nanograms per millilitre (ng/mL), highlighting widespread deficiency in this population.
Researchers divided participants into two groups: one receiving standard care and another undergoing regular blood testing with personalised vitamin D dosing to safely exceed the 40 ng/mL threshold.
Significant Risk Reduction
The treatment group experienced a striking 52% reduction in recurrent heart attacks compared to controls.
Epidemiologist Heidi T May from Intermountain Health stated: “Our results suggest that targeting vitamin D supplementation based on blood levels can significantly diminish the risk of subsequent heart attacks.”
Dr May, who presented the findings at the American Heart Association’s Scientific Sessions 2025, emphasized this approach “demands a personalised, vigilant clinical protocol that diverges from the traditional fixed-dose model.”
Clinical Implications and Cautions
Researchers recommend adjusting vitamin D supplementation every three months through rigorous monitoring.
While calling the effect size one of the most significant in recent vitamin D cardiovascular research, scientists urge caution until larger, peer-reviewed trials corroborate these findings.
Nonetheless, the data suggests nutrient optimization could pave the way for new heart attack prevention strategies.
