Shares of Herbalife ( HLF) were among the NYSE's losers Friday, plunging 20% after the nutritional-supplement maker cut its sales guidance for 2007. For the recently ended fourth quarter, Herbalife said it expects sales of $482.7 million to $484.7 million, in line with Thomson First Call's average analyst estimate of $488.3 million. The company expects earnings to be within its previously announced forecast of 52 cents to 55 cents a share. Looking ahead, Herbalife lowered its 2007 sales growth forecast because of slower-than-expected growth in Mexico. The company expects sales to rise 6% to 10%, compared with an earlier projection of 10% to 15%. Herbalife still expects earnings of $2.40 to $2.47 a share for the year. Shares were trading down $7.95 to $31.35. Global Payments ( GPN) sank 16% after the electronic-transaction processor offered a disappointing fiscal 2007 forecast. For the second quarter ended Nov. 30, the company earned $34 million, or 42 cents a share, up from $30.6 million, or 37 cents a share, a year earlier. Excluding certain charges, earnings were 44 cents a share, matching Wall Street's target. Revenue climbed to $260.7 million from $219.7 million, compared with analysts' forecast of $260 million. For the full year, Global Payments forecast revenue of $1.06 billion to $1.07 billion, shaving the top end off its prior projected range of $1.06 billion to $1.08 billion. Analysts, on average, projected revenue of $1.07 billion. Global Payments backed its forecast for earnings of $1.79 to $1.85 a share, before expenses for stock options. Still, that guidance is below Wall Street's target of $1.87. Shares were trading down $7.78 to $41.27.