How long have you been taking those items?
For me, it's very, very difficult to distinguish between placebo and actual benefit from pills like those. I haven't done it many times, but, when I do branch out and try something new, I generally do feel great for a week or two. When we start talking about months, I realize that I don't really feel "great" any longer and assume it was just a short-term placebo.
Of course, you could argue that I just get used to feeling good, but I generally don't start to instantly (or non-instantly) feel bad after I stop taking the stuff, so there's that.
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