kristen dahlgren has more. >> your brain is an amazing thing. >> reporter: you've probably seen the ads. >> the break through in prevagen helps your brain and actually improves memory. >> reporter: claims the ingredient originally found in jellyfish and marketed as an over-the-counter supplement prevagen can improve your memory in 90 days. but now the attorney general is charging the makers of prevagen with false and unsubstantiated claims. the complaint alleges prevagen manufacture quincy bioscience failed to show that prevagen works better than a placebo on cognitive function. in a strongly worded response, quincy says, we vehemently disagree. there's a large body of evidence that prevagen improves memory. there's no reason for a short-staffed and lame-duck ftc to rush this complaint through. prevagen costs $68 a bottle at amazon, cv s and walgreens. tonight it is still being sold while a judge will decide if the thousands who brought prevagen hoping to get their memory back should get their money back instead. >> our thanks to kristen dahlgren for that report. >>> still ahead, mike p