Herbal supplement. 450 mg Extract per capsule. 2.2% Volatile oil. 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% 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. Certified potency is your guarantee of dependable consistent quality and potency in every capsule every time! Only from Nature's Herbs. Our exclusive FreshCare System inhibits normal plant oxidation, maintaining product potency 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.