Quincy Bioscience, a maker of dietary supplements based in Madison, is the target of a class-action lawsuit over alleged consumer fraud.

Attorneys representing a nationwide class of supplement consumers filed the suit last week in a New Jersey federal court. At issue is Prevagen, an over-the-counter Quincy product that’s sold at pharmacies like Walgreens, CVS and Rite-Aid around the country.

The supplement’s key ingredient is a protein typically found in jellyfish that Quincy claims can improve consumers’ memories and foster a “sharper mind” and “clearer thinking.” In the past, the company has even suggested that Prevagen could assuage the symptoms of Alzheimer’s disease.

The attorneys behind the lawsuit say that those claims are bunk.

“The only reason a consumer would purchase Prevagen is to obtain the advertised brain function and memory benefits, which it does not provide,” they write in the complaint. “Prevagen is a singular purpose product: its only purported benefit is to enhance brain function and memory — which it does not do.” Read the full story here.