Mannatech, Incorporated (NASDAQ: MTEX) announced net sales of $39.7 million for the third quarter of 2019. The net sales reflected a decrease of $3.4 million, or 7.8 percent, as compared to $43.0 million in the third quarter of 2018. For the three months ended September 30, 2019, net sales declined 4.9 percent on a constant dollar basis […]