As we age, we lose protein that support our brain. Prevagen supplements these proteins during the natural process of aging. Supports healthy brain function. Only one capsule per day. Safe and clinically tested. Prevagen Extra Strength is designed to have twice the apoaequorin as regular strength Prevagen. Prevagen Extra Strength contains apoaequorin, a protein which uniquely supports critical brain functions. In clinical studies Prevagen improved memory within 90 days. Clinically tested in a computer assessed, double-blinded, placebo controlled study, Prevagen improved memory. Originally discovered in jellyfish, Prevagen is now made in a controlled scientific process.