people like wendy binion, an active young mother until her joints got so sore, she could barely walk.ly i couldn't even stand up, it was so painful to stand up. >> reporter: at first, no one knew what was causing it, least of all the doctors. >> when the blood tests came back, he said, we can't find anything. he said, this is the most exclusive blood test we can find. >> reporter: and still nothing. >> and still nothing. >> reporter: so what was making people so sick? before barbara was struck by the mysterious illness, she had started a new diet and a new liquid vitamin. could that be a clue? >> i just wanted a good supplement because i was dieting and i was afraid i wasn't getting everything i needed. and the store clerk recommended that. >> reporter: "that" was a liquid diet supplement called total body formula. this is the actual product. balance your body the way nature intended. the label had a detailed list of ingredients supposedly backed up by scientific testing. a republic outable -- reputable product bought by what she thought was a reputable store. >> i went back to get mo