I also agree targeted supplements is very important for some people. I really do not know where i would be if i had not started taking vitamin D for years. I have read that many Pulmos say if you take anything for Bronchiectasis take D. Of course if you have a high calcium issue you should not take D but that would be more rare. Getting your D levels tested once a year to see if your supplement is working is also a good idea. Some assimilate better than others. And adding vitamin K is important but take it at a different time or they compete. Vitamin C is also important for us. And of course probiotics.