 FLOWER MOUND, Texas--BUSINESS WIRE--Mannatech, Incorporated NASDAQ: MTEX, Mannatech, today announced that its Board of Directors has approved a share repurchase program to acquire up to 1.0 million of its outstanding common stock. The authorized repurchases will be made from time to time in the open market, through block trades or in privately negotiated transactions. The timing, volume and nature of share repurchases will be at the discretion of management and dependent on market cond 