This tonic is beneficial for blood glucose level. It stimulates cells in pancreas. Karela Jamun Juice is an effective natural remedy for high blood sugar. Karela acts as natural insulin to improve blood glucose levels. Jamun on the other hand also controls blood sugar by stimulating the pancreas. It also acts as a remedy for dysentery and diarrhea. Moreover, it improves the production of red blood cells. Together, they not only control blood sugar but also aid in digestion.