Soursop (graviola) leaf, annona muricata, is a natural powerhouse that has been used for centuries to promote health and well-being. They are packed with antioxidants, anti-inflammatory compounds, and other nutrients. It boosts the immune system; soursop leaves are a rich source of vitamin C, a powerful antioxidant that helps to protect your cells from damage. They also contain other antioxidants that can help to fight off infection and disease. Reduces inflammation: Inflammation is linked to many chronic diseases, including heart disease, cancer, and arthritis.