Prevagen® Extra Strength Dietary Supplement: Improves Memory Prevagen® Extra Strength Is Designed To Have Twice The Apoaequoorin As Prevagen Regular Strength. It Is Safe And Easy To Take. Each Bottle Contains A 30 Day Supply. Extra Strength 20Mg Apoagequorin Improves Memory 30 Day Supply ¹Based On A Clinical Study Of Subgroups Of Individuals Who Are Cognitively Normal Or Mildly Impaired. | Prevagen Extra Strength - 30 Capsules (30 Servings)