The A4 study: Now is the time to join the fight to prevent Alzheimer's disease.

Welcome to the A4 Study

Watch the A4 Study Video

Hear directly from Dr. Reisa Sperling and other Alzheimer’s disease experts explain the A4 Study, share what makes the A4 Study so unique, and why now is the time to participate.

Watch the A4 Study Video

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a4 study results