I started taking the pregnenalone after I had serious asthma/SOB flareups a few months after I had covid. So.... about 3 years. At that time I took 500 mg a day, then tapered down to a maintenance dose of 200 mg. Currently, I am again taking 400 mg a day as this spring has been especially hard on me. I also take Boswellia, Magnesium, NAC and thyme extract.