Most likely none. It’s not 100% clear what causes gallstones to form. Your body needs bile that is produced in the liver to help in food digestion, but if it has too much cholesterol it can cause gallstones to form. About 80% of the gallstones that are formed are cholesterol stones. As far as I know there are no studies that show that cannabis can help to decrease gallstones. That being said, cannabis might be able to help in pain reduction from acute attacks with a balanced 1:1 ration THC:CBD product.
Perry Solomon, MD