I asked a friend. We use supplements from wellnessresources.com
Quercetin can be found in vegetables, so each your veggies. Also chicken and hen of the woods natural mushrooms.
Here's what Dave says:
Quercetin is very good for the lungs - activates the SIRT1 gene (longevity gene).
NAC is also very good for the lungs - it might do autophage for them (self-cleaning).
I started taking more of byron's liver supplement lately & I think my athletic
asthma has improved. It does have NAC & R-alpha lipoic acid in it.
Oh, there is a supplement that allows the lungs to heal properly - proven to help fight
the growth of the random material in them.
Vitamin D has to be good for it.
For some reason, tocotrienol E is sticking in my mind, I don't know why.