Astragalus membranaceus has been used in Chinese herbal medicine for centuries. Due to its long history as a herbal remedy it has been studied for its anti aging, cardio protective and other benefits. The primary active ingredient in Astragalus is astragaloside IV which has been identified as a longevity agent and may have cardio protective effects. It has also been shown to activate T-cells to a higher degree than Echinacea in some studies which means Astragalus helps promote the immune system. Double Wood's Astragalus Capsules are Made / Tested in the USA, Non-Gmo, Gluten Free, . Each jar contains 300 Capsules (150 Servings) and each serving contains 1,000mg of Astragalus. That's enough Astragalus to last 150 days.