Nu Skin Enterprises, Inc. posted first quarter results with revenue that fell 7% to $543.3 million—but the company is optimistic about the rest of the fiscal year in regards to its new launches.   “Our business continues to make good progress as we prepare to introduce a number of new products in the second half of the year,” said Truman Hunt, president and chief executive officer. “We are encouraged by growing enthusiasm among our sales force in advance of launching our new ag...