Since Asthma and Seasonal Allergies are caused by the immune system
over reacting and steroids suppress the immune system, can taking
things like Vitamin C and things to help boost your immune system make
asthma and allergies worse ?  It just seems like they would be counter
acting each other, but I really don't know how that works, which is why
I'm asking.  Also would this be true of other diseases that are caused
by an over active immune system, like psoriasis?

Thanks for any input!