Link to one of the sources: http://www.timesonline.co.uk/tol/sport/more_sport/boxing/article6840630.ece
you got Salt and ammoniac in urine and both help for retaining water .... i'm guessing this why people think it give muscular mass ! And for the nutriments , were in 2009 i can't believe theres not the same effect naturals pills without having to drink your ****!