Suwasthi Karela Jamun Powder: A Natural Treatment for Diabetes. Due to the combined qualities of its two primary constituents, bitter gourd (karela) and Indian blackberry (jamun), it provides a variety of health advantages. The following are a few of this Powder's main advantages: 1. Diabetes Management, 2. Digestive Health Support, 3. Weight Management, 4. Immune System Boost.