The effects and benefits of cat grass:
1. Helps enhance a cat's digestive function. Cat grass is rich in plant fiber, which can promote intestinal peristalsis and enhance a cat's digestive function.
2. It helps cats vomit hairballs and prevent hairball syndrome. Cats have a habit of licking their own fur, and excessive hair accumulation in the intestines can easily cause hairball syndrome. Feeding cats cat grass can induce vomiting of hairballs. 
3. Cat grass can supplement some of the cat's nutrition. Cat grass contains certain vitamins, fiber, minerals, etc., and feeding cat grass can supplement some of the cat's nutrition.
4. It can help prevent oral diseases in cats. When cats chew cat grass, they are cleaning their mouths, which helps prevent oral diseases.
5. It helps cats relieve stress and relax. Cats feel very relaxed when chewing cat grass, and eating cat grass helps relieve stress and relax.