On the green tea front, I'd heartily recommend going to some hole in the wall Japanese cafe sort of a place and giving a smell to all of them. Straight gunpowder green tea is kind of bleh in my book, too, but I've always enjoyed jasmine teas, and I dig the smell of genmaicha.
My understanding is that they all come from the same plant, and just have different other plants in addition.
As for the charts, I feel like the top half has a lot more legitimacy than the bottom half -- that, really, to do something like this, you need to be very clear about what result is intended. Saying all vitamins are below the "worth it line" is kind of, in my mind, silly, if you aren't going to be fairly clear as to what result you are hoping for. Yeah, taking a multivitamin won't keep you from getting hit by a car, but there's some middle ground.
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