Greenhouse gas emission: While ethanol use is beneficial for the environment, an article in BioScience suggests that the greenhouse gasses emitted during production of the fuel cancels out that effect.
According to Quincy Bioscience, the company that manufactures the product, Prevagen can reduce brain cell death by as much as 50%.
Note that the information in the book may not be completely unbiased, since the Underwood is the president of Quincy Bioscience.
Quincy Bioscience sells Prevagen on its product website in packs of one, three, six or 12 bottles.
Frontiers in Bioscience 5 (March 1, 2001): 298-306.