how do you know that they work? i tried quadramune for two months and felt no difference. you know what would have helped me with confidence in shelling out $70 a month? doing a clinical trial proving it. many supplements have clinical trials, the one that is supposedly the most potent immunity booster couldn't find a partner to do trials? couldn't recruit during a deadly pandemic? thank you for reminding me of yet another failed initiative. i do see some scientists studying the ingredients which is good but still doesn't help us here.