Vitamin C and iron, which are abundant in guava juice, can lessen the symptoms of seasonal illnesses including the flu, colds, and coughs. As a matter of fact, one guava offers almost double the recommended daily intake (RDI) of vitamin C. This is nearly twice as much as what one orange would provide! Regular ingestion can prevent cell deterioration and development. Therefore, for a healthy body and way of life, guavas should be a regular part of your diet, whether they are whole fruits or juice.