With its sour and a little bitter taste, Doal Grapefruit which strengthens the immune system is very rich in antioxidant and fiber. It contains vitamin C that can deal common cold especially in the winter months. Doal Grapefruit can be consumed by anyone who wants to have a healthy and shiny skin as it helps the formation of collagen in the skin. Doal Grapefruit is also very effective when fighting infections and miraculously good for oral and dental health.