Authored by Jack Phillips via The Epoch Times (emphasis ours),

Researchers found that adult heart attack survivors who took specific vitamin D doses reduced their risk of developing another heart attack by more than half, compared with people who did not take the vitamin D dose.

Research done by Utah-based Intermountain Health found that there was a 52 percent lower risk of suffering another heart attack in people who already survived one and who received "personalized dosing of vitamin D supplements" to reach vitamin D levels of 40 nanograms per milliliter for around four years, said a news release from the American Heart Association (AHA).