* Cayenne or Magnesium can stop a heart attack in progress. A tincture of cayenne is probably best, but cayenne powder should work too. So should other hot peppers. Magnesium should work in various forms, such as Mg Citrate, Mg Oxide etc.
* Dr. Bruce West says the heart is a muscle and a heart attack is a muscle cramp of the heart. A heart attack is beri-beri of the heart, due to Vitamin B4 deficiency. Vitamin B4 (adenine) is found in brewer's yeast, whole grains, raw unadulterated honey, bee pollen, royal jelly, propolis, most fresh vegetables, most fresh fruits.
* Dr. Mary Enig says unnatural fats, like hydrogenated vegetable oil, may contribute to weak blood vessels, heart attacks etc. Saturated fats and cholesterol are vital nutrients that are needed by every cell in the body, especially the brain, nerve cells and hormones etc. See Good & Bad Fats.