[This review was collected as part of a promotion.] It's impossible to say if a vitamin is good or not — anyone who says they feel differently is falling victim to the placebo effect. Mostly, it makes expensive pee. In this case, it turns neon yellow, so it's at least doing that. For that reason, this is just as effective as any other vitamin and since it costs more that your average daily vitamin, it must be a good one, right?
It tastes fine and doesn't have any ill effects on an empty stomach. It works for me.