Tryptophan, found in food, is an important ingredient in the neurotransmitter serotonin. But is that enough to support it as a possible mood booster? The research is decidedly mixed.
Watch out for the top guy.
Horatiu Bota/Shutterstock
There are many examples of hierarchies in the animal world. Bees, for example, send males off to die after breeding season.
St John’s Wort has been proven to be as effective as medicinal anti-depressants in treating mild to moderate depression.
Wisconsin Department of Natural Resources/Flickr
The flowering tops and aerial parts of the St John’s Wort plant are used medicinally in the form of tinctures and tablets to treat a number of conditions affecting the nervous and immune systems.