This reduction may play a critical role in the aging process. Melatonin studies with rats have revealed possible life extending properties of the hormone. Melatonin inhibits tumor growth and decreases the risk of certain types of cancer. Studies have revealed melatonin's ability to inhibit breast cancer tumors. Mental Mood Melatonin has been shown to have beneficial effects on mood for manic-depressive patients.
Studies show links between low melatonin levels, anxiety, general fatigue, and hostility.