Welcome!
I've not personally heard of any supplements or nutritional recommendations that I've heard of that have helped me avoid my yearly bout of bronchitis.
I think my advice would be to try and figure out if your bronchitis is caused by the same thing every time -- is it viral, is it bacterial, or does it usually follow allergies? I took years and years worth of antibiotics before figuring out my bronchitis happened at the same time every single year, was never contagious, and was never helped by the antibiotics. I found getting my allergies under control helped this greatly!
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