The safety FAQ asks people with diagnosed conditions to get medical advice first.
A supplement is not a treatment, and a diagnosed condition usually comes with medications and monitoring that a supplement could affect. The page states BreathiZen is not intended to diagnose, treat, cure or prevent any respiratory disease.
Bring the ingredient list: Mullein Leaf Extract, Ginger Root Extract, Bromelain, Organic Lemon Extract and Organic Cordyceps Militaris Extract. Ginger and Bromelain especially deserve a mention if you use blood thinners.