Graviola also called guanabana is a powerful tree that grows deep within the Amazon rain forest in South America and throughout the Caribbean. The plant has been used for centuries by medicine men in South America to treat a number of ailments, including hypertension, influenza, rashes, neuralgia, arthritis, rheumatism, high blood pressure, diarrhoea, nausea, dyspepsia, ulcers, ringworm, scurvy, malaria, dysentery, palpitations, nervousness, insomnia, fever, boils and muscle spasms. According to recent research it also protects the immune system and boosts energy.