St. John's Wort Dietary Supplement Is Derived From Fresh St. John's Wort Flowering Tops For Maximum Efficacy And Potency. Each 30-drop Dose Provides An Herb Weight Equivalence Of 500 mg. And Can Be Easily Added To Water Or Juice For Pleasant Dosing. This 1 Fl. Oz. Bottle Contains 30 Servings And Has A Convenient Dropper Top For Ease Of Use.