St. John's Wort Extract 300 mg, Value Size, 240 Capsules, Source NaturalsSt. John's Wort Extract 0. 3% Hypericin 300 mg and 450 mg tablets, 300 mg capsules A daily intake of St. John's wort herb, standardized to 2. 7 mg of hypericin, may support a positive outlook and mood. St. John's Wort is far from new it has an impressive history of use in traditional cultures. But its use in supporting a positive mental outlook is gaining newfound acceptance. And today, science has given us the tools to offer a St. John's Wort product