If you have done the Master-Cleanse for 10 days that means you are fasting and when you fast your digestive system shuts down after day 3 (info available in FAQ's or Recommended readings). When you do a Liver Flush you are drinking 1/2 cup of oil. When you drink oil (a fat) it requires your gall bladder to produce bile which helps your body digest fat. Since you have been fasting your gall bladder is shut down and it will probably revolt violently at the sudden dumping of that much oil. Wait at least a week to make sure all your systems are go.