Some evidence suggests that thymus extract might help ward off respiratory infections, such as bronchitis. This research has focused on people prone to respiratory infections. Other reasons a person may take thymus extract include fighting off hay fever and sinusitis that can all affect the respiratory system.
Some asthma attacks are triggered by an overactive immune system. Some research suggests that taking thymomodulin helps reduce the severity of asthma attack symptoms. It may also help reduce the frequency of asthma attacks.