St. John's Wortopen_in_newbotanicalSt. John's wort is used to support mood and relieve symptoms of mild to moderate depression. It is believed to affect serotonin, dopamine, and norepinephrine in a way similar to some antidepressants.$17.27 median price$0.30 per serving$0.04 per 100 mg300 mg per serving Show details expand_more