The truth that I have seen is that many Americans suffer from some type of ailment that traditional medicine offers no elucidation of the cause. It could be diet, lack of exercise, mental health but there is not explicit test to say, "yes, you have ailment X because of Y."

So what is one to do? IMHO, the best one can do is to persevere and try to survive the best they can. One way of doing that (and I think a very productive way) is to be a scientist of your body and try different things. For some exercise works, for some vitamins, for others a certain type of diet.

I will not judge another for trying to take care of themselves as best they can. However, I will judge against how scientific they are about doing so to a degree only to critique their methods in hopes they can reach a state of reasonable comfort if they havent already obtained it.

Spend an afternoon reading examine.com. Follow the studies. Read conflicting studies. Read about placebo. You will see that these supplements do help a significant portion of the populate for condition X. Not everyone though and likely because conditions X is really a superset of conditions X0, X1, ... XN. Until we can elucidate condition X into its true subcomponents, I think Americans will continue to seek their supplements.