Zincis a building blockof thebodyand a deficiency inzinc can lead tostuntedgrowth, diarrhea, impotence, hair loss, eyeandskinlesions, impaired appetite, anddepressedimmunity.
Other companies, such as Neurogen, Aventis and Neurocrine Biosciences, are in early tests of drugs that block a damaging stress hormone often elevated in depressed patients.