The Energy Supplements 500 mg / 0.7% Parthenolide Standardized Botanical Supplement Guaranteed Maximum Potency Prescription Quality Gluten Free Vegetarian Hypo-Allergenic HerbaShield Nutritional Support for General Well-Being. Each Herbal Actives extended-release formula provides rapid and sustained results. Supplying the greatest concentration of active botanical principles, Herbal Actives Feverfew maximizes the synergistic benefits of the whole leaf. Guaranteed Maximum Potency: Each Herbal Actives formula is scientifically standardized to the highest level of active principles. HerbaShield: An exclusive purity and safety system providing light-resistant bottle, airtight inner seal, moisture-absorbing packet, tamper-evident safety cap and tamper-proof full bottle seal.