steve, I wouldn’t expect anything to happen in two months! I took it for about five years. It’s hard to answer your question exactly, but looking back, my breathing is no worse than it was several years ago, which is not what one would expect. I feel a lot better. I guess it all happened gradually.
I do also take other supplements. Black seed oil (please look it up) helps me to feel better overall, without being specific. Lots of vitamins and minerals,and NAC which keeps my cough loose. The serrapeptase was expensive, but the price varied depending on where you bought it. I found iherb to have the best prices.
Gentle exercise is very important also, I have come to realise. I used to think “I can’t exercise, I get too breathless”. But I have learned that being breathless does no harm, even though it is unpleasant.
If you would like to correspond with me further, you can email me: julwood at iprimus dot com dot au (safe way to put your address online). Obviously I can’t/ don’t give medical advice, but I’m happy to share what worked for me.