The Karunkuruvai is an important sub species of kuruvai (summer crop) rice variety. Dark brown to black in colour, this rice helps treat elephantiasis, arthritis, and chickenpox. The Karunkuruvai grain is believed to have ‘Kayakalpam’ properties as it helps protect the body and keep it healthy. Siddha doctors use this rice variety to treat certain conditions, including repairing cell damage. This nutritious grain is believed to control diabetes, cholesterol, blood pressure, and purify blood.