St. John's Wort extract is a standardized preparation from the flowering tops of *Hypericum perforatum*. Herbal medicine uses it to support a balanced mood and emotional well-being. Standardized extracts concentrate the active compounds hypericin and hyperforin, producing more consistent effects than raw herb preparations.
Most people take it as capsules or tablets in the morning with food. Watch out for drug interactions. St. John's Wort strongly induces liver enzymes like CYP3A4 and CYP2C9. It can make many medications less effective, including oral contraceptives, antidepressants, blood thinners, and statins.
Sunlight sensitivity may increase while using this herb. Talk to a professional before combining it with any medication.