With the double whammy of winter travel and the continuing pandemic, I'm all about doing things to help my respiratory system. I'm not a scientist or nutritionist, so leave it to you to evaluate the product ingredients and claims. What I can say is that these are easy to take and have not caused me any side effects. For what it is worth, I traveled thousands of miles on full aircraft, and spent several weeks in temperatures just above freezing â€" which meant central heating and the occasional fire in the fireplace. Although I occasionally felt dried-out from the heating, I didn't have any respiratory issues (and this combination generally results in feeling rundown or having Cold symptoms