Vitamin D Supplements Show No Clear Heart Disease Protection

Vitamin D supplements show no clear benefit in preventing heart disease or reducing related deaths, despite low vitamin D levels being linked to higher heart disease risk, according to a recent review. Evidence does not prove low vitamin D directly causes heart disease, as the relationship appears complex. Some studies, including a 2023 trial, suggested supplements might reduce major cardiac events like heart attacks, but results remain inconsistent. The National Institutes of Health recommends 600 IU daily for adults under 70 and 800 IU for older individuals. Supplements may be needed for those with fat absorption disorders, older adults, and dark-skinned individuals, but doses above 4000 IU daily can cause side effects.