Nauli kriya is said to help cleanse the abdominal region, including the stomach and intestines. Whether it actually does this or not is open to debate, but when practiced properly there is no question that nauli kriya has a deeply stimulating effect on both the mind and body. Many practitioners may find it quite difficult to master, but like uddiyana and all bandhas, any sincere effort to learn the technique will almost assuredly prove fruitful in one way or another.