Unfortunately despite known benefits of some herbs such as fenugreek seeds, there is not much scientific evidence except karela (bitter gourd). Many diabetic patients have claimed benefit from fenugreek seeds and personally I am inclined to accept its utility. One should take natural fenugreek seeds rather than a formulated product. Since the regulatory control and monitoring over such products is very poor, it is best to take natural seeds despite great effort that is required to clean them.