Usana reported that sales in the fourth quarter of 2007 increased by 10.8 percent and reached $108.7 million, compared with $98.1 million in the fourth quarter of the 2006 fiscal year. Its fourth quarter profit, however, fell slightly to $11.06 million, or 67 cents per share, from $11.1 million or 61 cents per share in the same quarter a year earlier.

The company said that during the fourth quarter in North America it experienced softer-than-expected sales and associate numbers.

"We attribute this decline primarily to the toll that various false allegations have taken on our associates during 2007," said Dave Wentz, the company's president. "We believe that these challenges are now largely behind us."