OxyElite Pro
Credit: Daryl Solomon / Getty Images

In November, USPlabs agreed to a voluntary recall of OxyElite Pro after the FDA informed the company that the "fat burner" had been linked to dozens of cases of hepatitis in Hawaii (two of which required liver transplants) and one death. The government believes that the problem may lie with aegeline, a synthetic version of a compound found in the bael tree. This is the second time OxyElite Pro has been taken off of the market this year. In 2012, the FDA ordered USPlabs to destroy OxyElite Pro containing a stimulant called dimethylamylamine, or DMAA, which can cause heart attacks and may have killed six people.