Has anyone used Nattokinase or serrapeptase

I have just read about people who have used both of these supplements and have had really amazing improvement in their lung health. I read this on the Pulmonary Fibrosis news forum. I'm always nervous about taking some supplements. I sure would like to see some improvement. I've been exercising on a NuStep machine at a wellness center but could only get there a couple times a week. I decided to buy one to have at home. So now I can use it every day. I'm just so exhausted after using it. I do about 20 minutes in the morning and do another ten minutes in the afternoon. I can hardly do anything else. I really need some help! Any suggestions would be greatly appreciated!
Thanks