Collagen supplements are taken in one of two different forms, either in the form of hydrolyzed collagen or in the form of an undenatured type II collagen; both forms have different dosing strategies and while their benefits may share some similarities can be considered two different supplements.
Other tests, including imaging (see Chest Imaging), bronchoscopy (see Bronchoscopy), and thoracoscopy (see Thoracoscopy), allow doctors to determine the specific cause of a lung disorder.
  Pulmonary function tests are a group of tests that measure how well the lungs take in â¦ and release air and how well they move oxygen into the blood.   Nothing you can do in advance of a test can change this.