A new clinical trial suggests that monitoring and personalizing vitamin D3 supplementation after a heart attack may sharply reduce the risk of a second one. Researchers found that regularly measuring vitamin D levels and adjusting supplement doses to reach an optimal target cut the chance of another heart attack by 50%. The findings point to a potential shift in how doctors manage recovery after a first cardiac event.
This approach differed from past studies, where vitamin D dosing wasn’t personalized. In the new trial, most people started out with low vitamin D and needed higher doses than standard guidelines recommend. With regular testing, many reached the target range, and their risk of a second heart attack dropped compared to patients who didn’t receive personalized vitamin D care.
Vitamin D deficiency is extremely common, and heart disease is the world’s leading cause of death. The findings suggest that a “treat-to-target” method — adjusting supplements based on actual blood levels — may offer better protection than standard dosing. Larger studies are needed to see whether this approach can also reduce the risk of stroke, heart failure, and other complications.
SOURCE: