After using cat’s claw herb in working with approximately 150 patients between 1988 and 1992, Dr. Brent Davis reports that “Uncaria tomentosa has the ability to break through severe intestinal derangements that no other available products can touch.” He refers to the herb as “the opener of the way” because of its remarkable ability to cleanse the entire intestinal tract and help patients suffering from many different stomach and bowel disorders including leaky bowel syndrome. irritable bowel syndrome, Crohn’s disease, diverticulitis, hemorrhoids. fistulas. gastritis, ulcers, parasites and intestinal flora imbalance