In a study on type 2 diabetics, issued in Nutrition Research, in 1996, 25 grams of powdered fenugreek seed was given twice a day in addition to the medication therapy.

The result was the decreasing of average fasting glucose from 151mg/dl to 112 mg/dl. Also the glucose levels two hours after meal were decreased together with the average A1C from 9.6 % to 8.4 % after 8 weeks.  Source  of  this  info is    http://www.all-about-beating-diabetes.com/fenugreek-for-diabetes.html