well, i'll try to be helpful...
truth be told, i have found very little obvious effect from taking supplements, other than the thought that maybe my health would be even worse if i didn't take them. i take turmeric, fish oil capsules, cinnamon capsules, vitamin c, vitamin e, multivitamins, aside from my scripts.
i noticed that since i started taking the fish oil capsules, my skin is markedly less greasy, so i take that as a sign my total cholesterol has gone down- it was elevated at nearly 400mg/l, and the last time i rechecked it, it had gone down to the low 200s range. but i don't know how much of that is also influenced by my 20 mg. of lovastatin and also the vigorous daily exercise regimen i undertook. the turmeric is supposed to cut inflammation and indeed my arthritic SI joint hurts a bit less and is less stiff. again, however, i don't know how much of that is influenced by the exercise regimen. the cinnamon is supposed to better regulate my blood sugar, but it was normal to begin with, but i am hoping to avoid my late father's fate with diabetes, so i will keep on with the cinnamon. linus pauling swore on vitamin c's general health-boosting qualities, and since he was smarter than me i must defer to his judgement- i have taken C supplements since my teen years and indeed, i have not often had colds and influenza but when i do get caught, i am sicker than a dog.
in the past, i tried valerian root to help me relax, but it had no obvious effect on me, IOW after i took some i was as keyed-up as i normally was. i avoided kava due to the fact that i have liver issues and kava has been implicated in liver failure in folk with weak livers. but i have known folk who took it to help them sleep and it worked well for them. i took echinacea for a maximum of 3 weeks straight, for many years in an attempt to ward off whatever bug came down the pike, and indeed i didn't get sick often for many years, until i turned 40- but i don't really know how much of that was just dumb luck.
sorry but my personal experience is just no substitute for a quality double-blind clinical trial.