With all of these benefits and more, noni fruit is effective for supporting and improving health. The fruit is used to promote digestion, relieve pain, increase energy, prevent skin and hair issues, disable degenerative diseases, and fight cancer.ith all of these benefits and more, noni fruit is effective for supporting and improving health. The fruit is used to promote digestion, relieve pain, increase energy, prevent skin and hair issues, disable degenerative diseases, and fight cancer.