Mason: A law firm allopurinol alternatives uk A Pershing Square representative said on Friday the timingof the Herbalife presentation before a crowd of 500 was dictatedsolely by when the firm completed research for laying out itsargument that the nutritional supplement manufacturer is apyramid scheme. Herbalife's shares have soared 97 percent thisyear, costing Ackman more than $300 million in paper losses, butthe hedge fund is sticking by its bet. Herbalife has repeatedlydenied Ackman's claims.