Casually called SJW or St. John's, it is an herbal antidepressant. It works similar to Prozac by blocking the absorption of seratonin, though is cheaper, more accessible (as it doesn't need a prescription), and doesn't have any side effects (other than actually being happy for once). I like to ingest about 300mg daily for a few days, then not take any for a couple days so I remember how much nicer anxiety is than self-loathing.