Bombardelli, Ezio, and Morazzoni, Paolo. Duke, James A., Handbook of Medicinal Herbs . Foster, Steven, and James A. Duke. Mixing St. John's Wort with drugs. Herb works for depression.
Happiness is a warm neurotransmitter.
The Herb Society of America Encyclopedia of Herbs and Their Uses . Deni Brown, Dorling Kindersley 1995, p295. Lauri M. Aesoph. Dealing with depression. Sunny-yellow St. John's wort to the rescue.