Natures Sunshine Olive Leaf Cardiovascular Support may be beneficial in supporting the body to fortify the immune system for seasonal ills and chills. Most people know the benefits of olive oil for supporting circulatory health. Similarly, Nature's Sunshine Olive Leaf Extract supports several circulatory needs all at once, including healthy blood pressure, arterial health, heart rhythm and free radicals. Oleuropein, a key constituent in olive leaf, is a polyphenol thought to support healthy cholesterol balance.