4 Grapefruit Juice Health Benefits Grapefruit is very rich and an excellent source of vitamin A and vitamin C. Health Benefits of Grapefruit. 1. Antioxidant Activity. Grapefruit contains phytonutrients called limonoids that inhibit tumor formations, the pulp of grapefruit contains glucarates, and compounds that may help prevent breast cancer and grapefruit juice is ranked among […]