Twenty-six men scheduled for radical prostatectomy were randomized into three groups and treated as follows : Group 1 ( skim milk , 0 % fat ) , Group 2 ( supplement with 6:3 ratio of 8:1 and arginine ) and Group 3 ( supplement with high 9:6 ratio of 3.2:1 and low 6:3 ratio of 1.4:1 and arginine ) .