Daily Vitamin D3 Could Lower Heart Attack Risks
A simple daily habit might just help those at risk of cardiac arrest. A recent study from Intermountain Health in Salt Lake City discovered that for individuals who have previously experienced a heart attack, taking vitamin D3 supplements could significantly lower their chances of having another one.
This large randomized clinical trial involved closely monitoring the blood levels of vitamin D in patients, adjusting dosages to achieve “optimal concentrations,” as noted in a press release.
Interestingly, heart attack patients who received high doses of vitamin D3 saw their risk of a second heart attack reduced by half. The results were shared during the American Heart Association’s 2025 Scientific Sessions held in New Orleans.
The study, named TARGET-D, included 630 patients from April 2017 to May 2023. A significant 85% of these individuals had insufficient vitamin D3 levels at the outset.
Participants were separated into two groups: one received targeted vitamin D3 treatment while the other did not. The aim was to elevate their vitamin D blood levels to at least 40 nanograms per milliliter.
Throughout the year, participants in the treatment group had their blood levels checked to ensure they were maintaining that target. More than half needed an initial dose of 5,000 international units (IU), exceeding the general adult recommendation of 600 to 800 IU daily for maintaining healthy levels.
Participants were tracked until March 2025 to evaluate their cardiovascular health, with 107 experiencing a major cardiac event.
Dr. Heidi May, the principal investigator and a cardiovascular epidemiologist at Intermountain Health, mentioned that there were no adverse outcomes linked to the high doses of vitamin D3 given. She expressed excitement about the findings, yet acknowledged that further validation is necessary.
Dr. May also highlighted that normal vitamin D levels can decrease the likelihood of coronary artery disease, heart failure, and stroke. It’s noted that up to two-thirds of the global population has low vitamin D levels, often due to lifestyle changes that limit sunlight exposure, which is a natural source of this essential vitamin.
Dr. Bradley Serwer, an interventional cardiologist, emphasized that it’s been well-established that optimal vitamin D levels provide significant cardiovascular advantages. He pointed out that previous research linked lower vitamin D levels to higher risks of hypertension, coronary artery disease, and heart events.
However, it’s worth noting that past studies have struggled to show definitively how effective vitamin D supplements are in reducing heart attack risks. Often, those studies used standard replacement doses which might not be enough to restore healthy vitamin D levels.
While this new study’s findings indicating a 50% reduction in the risk of a second heart attack are promising, experts caution that they specifically target high-risk patients. Additional research is needed to determine the benefits of vitamin D supplementation for individuals at lower risk.
Ultimately, the conversation around vitamin D is crucial. It’s characterized as “more of a hormone than a vitamin” and plays an essential role in organ function, including that of the heart. This ongoing exploration into vitamin D and heart health could mean big things for those vulnerable to cardiovascular issues.
