Nu Skin Enterprises, Inc. posted a 3% decline in second-quarter revenue to $650.0 million. Revenue was negatively impacted 2 percent by foreign currency fluctuations, said the company.   “Our business performed in-line with our guidance for the quarter, with the exception of the China LTO, which occurred shortly after resuming our promotional efforts and did not meet our expectations,” said Truman Hunt, president and chief executive officer. “We are pleased, however, that we ha...