What is the scientific basis for giving cats cat grass?

The scientific basis for giving cats cat grass is mainly the following: 1: Cat grass can be a proper supplement of vitamins and plant fibre. 2: Cat grass can help the hair to be expelled by stimulating the stomach mucosa to cause vomiting or by strengthening the peristalsis of the gut. Cats will swallow the hair they lick when grooming. The hair enters the stomach and is difficult to excrete through the digestive tract and to digest and decompose, so cats will vomit these hairs out through the act of vomiting hairballs.3: Cat grass contains a component called thorny lactone, a substance that gives cats a sense of satisfaction and makes them feel happy.