Key points from article :
Data collected from 277 trials, 24 different nutritional supplements in nearly 1 million people.
Lower salt intake reduces the risk of death in people with normal blood pressure.
Omega-3 fatty acid supplements slightly reduce the risk of a heart attack and coronary disease.
Folic acid slightly reduces the risk of stroke.
Combination of calcium and vitamin D supplements can increase the risk of stroke.
Study was published in the peer-reviewed journal the Annals of Internal Medicine.
