Pumpkin, belonging to the gourd family, is a great source for immune-promoting nutrients like vitamins A, E, and C, omega-3 fatty acids, zinc, selenium, iron, magnesium, and beta-carotene. The fruit, seeds as well as the leaves all are beneficial for the human body.Pumpkin, belonging to the gourd family, is a great source for immune-promoting nutrients like vitamins A, E, and C, omega-3 fatty acids, zinc, selenium, iron, magnesium, and beta-carotene. The fruit, seeds as well as the leaves all are beneficial for the human body.