Srila Prabhupada: One who hears the transcendental sound vibration of the holy name of the Lord, Hare Krishna, also improves in health. We have actually seen that many brahmacaris and grhastas connected with the International Society for Krishna Consciousness have improved in health, and a luster has come to their faces. (Srimad Bhagavatam, 3.21.45-47 Purport)