Effects of vijaysar herb in diabetes is well documented in clinical trials and is found to reduce fasting blood sugar (fbs) & post prandial blood sugar (pbs). it also prevents development of long term complications of diabetes. vijaysar is a reputed herb used in ayurveda & other traditional systems in the treatment of diabetes. It is a rich source of pterosupin pterostilbene marsupsin& (-)-epicatechin which are identified as blood sugar lowering compounds. the aqueous infusion of the wooden core of the vijaysar tree has been found to reduce glucose absorption from the gastrointestinal tract & improve insulin and pro-insulin levels. our product the vijaysar herbal wooden tumbler makes this for you when you pour normal drinking water in it.......PLEASE NOTE: In some cases the wooden tumbler being natural wood gets mild cracks resulting of leakages from the tumbler & so nothing to worry as it still can be used by dipping in a pan of water & leaving it overnight or span to time to get extracted result of the wood naturally.