St. John's Wort Extract Standardized to 0.3% Hypericins Supports a Positive Mental Outlook Source Naturals ST. JOHN’S WORT EXTRACT is standardized to 0.3% hypericins, providing 2.7 mg hypericins per day. A daily intake of 2.7 mg hypericins from St. John’s Wort may support a positive outlook and mood. Benefits may be experienced within 4 to 6 weeks of initial use.*
