. >> narrator: candice tripp called her vitamin company purity first. she says she was helped by her then husband terence dulin, a chiropractor. and what was his academic background or expertise in this area? >> he was a chemist. he was a chemist in college and then he went on to chiropractic school. >> narrator: from modest beginnings, she said she grew the business into a half a million dollar a year enterprise, selling on the web, in stores, and through local alternative healthcare providers. >> purity first is a great name, and i said, "gee, how can you go wrong? it's what you would imagine that you would want in every single vitamin. it's absolutely pure. >> narrator: vinnie grosso was an early purity first customer. the vitamins became part of his daily quest for better health. >> i felt fine, and of course you know, i'm running every day, i'm feeling great, up until the october, november, december time frame of 2012 where i had some very unusual symptoms. >> narrator: it started with unexplained back pain that soon became debilitating. he then st