frontlines of social change worldwide. at fordfoundation.org. the park foundation, dedicated to heightening public awareness of critical issues. the john and helen glessner family trust. supporting trustworthy journalism that informs and inspires. and by the frontline journalism fund, with major support from jon and jo ann hagler. >> the guerrilla army that roared east to take over... >> narrator: it was early 2014. >> isis has seized many iraqi cities. >> narrator: they seemed to come out of nowhere. >> in northern iraq, a number of districts have been taken over by fighters. >> militants have swallowed up territory, and they're pushing toward baghdad. >> narrator: the terror group isis started capturing key territory in iraq. >> the jolting gong was when they swept into western iraq and took control of a third of western iraq. the banks that were robbed and stripped, the assets that were stripped in that entire area was huge. and that was, as i said, the jolting gong that said, "wait a minute, how could this happen?" >> deep concern about isis pushing into baghdad. >> isis has been seizing territory in iraq. >> they were able to swiftly take over huge areas of iraq. it was shocking how the army didn't even fight, didn't even put a fight. >> and taking over mosul

and by the frontline journalism fund, with major support from jon and jo ann hagler. >> this is a product that was formulated for people who are under severe stress. >> so this is an herb that would be great for older individuals that are concerned about their memory... >> narrator: it's estimated that half of all americans take a health supplement every day. >> that one is going to be amazing for supporting the... >> encapsulates the nutrients in a non-gmo... >> this is a very potent antioxidant. >> narrator: it's a $30-plus billion industry. >> i will guarantee you that this will change your reality within three to five days. >> narrator: companies range from big pharma to mom and pop. >> i started in my kitchen making them by hand back in the '80s. i would order the ingredients, i would order the capsules. and with a plate of 100 capsules, i would weigh it out and fill them up, and you have a bottle of 100 capsules of any particular vitamin you wanted. >> narrator: do you have a background in pharmacology, or medicine, or any expertise in this area? >> i did some c