Certified Potency Celery Seed-Power is the highest quality, most potent and most effective form of Celery Seed Extract available. Utilizing a 6:1 standardized extract, Celery Seed-Power constituents including volatile oil, which contains terpenes, especially limonene (60-70%) and selinene (5-10%) and approximately 15% of phtalides, principally 3-n-butyl phtalide and its 4.5-dihydro derivative sedanenolide. It is these latter compounds wghich give Celery Seed its distinctive smell. Nature's Herbs Certified Potency Power-Herbs, Celery Seed-Power. Apium graveolens. Our exclusive FreshCare System inhibits normal plant oxidation, maintaining product and extending freshness. It includes all-natural antioxidants in each capsule, oxygen-absorbing packets in each bottle, special air-tight seals and amber glass packaging for uncompromised quality. This Certified Potency symbol is your guarantee of dependable consistent quality and potency in every capsule every time! Only from Nature's Herbs. Certified Potency Celery Seed-Power is the highest quality, most potent and most effective form of Celery Seed Extract available. Utilizing a 6:1 standardized extract, Celery Seed-Power constituents include volatile oil, which contains terpenes, especially limonene (60-70%) and selinene (5-10%) and approximately 15% of phtalides, principally 3-n-butyl phtalide and its 4.5-dihydro derivative sedanenolide. It is these latter compounds which give Celery Seed its distinctive smell. Each gelatin capsule is preservative-free. Nature's Herbs, Nature's Power. Since 1969.