St John's Wort Mood Formula from Solaray supports a healthy mood with a mix of St John's Wort, l-tyrosine, Dl-phenylalanine, 5 Htp, ginkgo and velvet bean.An herb, St John's wort contains many active substances -- such as flavonoids, anthracenes, volatile oils, catechins and sugar alcohols -- that may account for any beneficial properties. However, two chemicals in St John's wort, hypericin and hyperforin, may act on chemical messengers in the nervous system that regulate mood.