13 Mar 2014 --- A natural product found in grapefruit can prevent kidney cysts from forming, new research indicates. Naringenin, which is also present in other citrus fruits, has been found to successfully block the formation of kidney cysts, an effect that occurs in polycystic kidney disease, by regulating the PKD2 protein responsible for the condition. With few treatments currently available, symptoms include high blood pressure and loss of kidney function, and lead to the need for dialysis.