Nu Skin Enterprises, Inc. posted preliminary fourth quarter results, with estimated revenue of $1.075 billion. Revenue was negatively impacted 4% by foreign currency fluctuations, according to the company. “We are pleased with our 2013 results and are focused on sustaining growth in 2014,” said Truman Hunt, chief executive officer. “Given the current review of our business in China and our desire to provide the most informed guidance possible, we are rescheduling our full earn...