Paavo Airola recommends this preparation and one cup is said to be equivalent to one unit of insulin. Other bean pods (such as runner, kidney, and pinto) are also useful.
String bean pods (cut): 3 to 4 tablespoons
Purified water: 2 pints
Prepare a standard decoction using the pods and water. Simmer for one-half to one hour in a covered saucepan. Use three cups per day.