re: Bucked up

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Personal tolerance has to be assessed to know how "safe" it is for you. In general, yes it's safe. There are as many pre's now as blades of grass in an average yard, but Buck Up is on of the better known varieties.

I find that pre helps me, especially with a moderately physical day job and workouts in the evening. On the other hand, some days I'm good to go without.

The tingles are likely "niacin flush" or, as another poster said, possibly the beta alanine. It can be an unpleasant side affect, but is largely harmless.

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I can tell you from personal experience that it is mainly the caffeine that is effective. I do not rely on pre-workouts and stimulants much. IMHO you have to be careful as you can build up a tolerance to them and then need more and more. I only use them a couple of times a week for my "big" days. By limiting my coffee/caffiene intake, it only takes a little pre for me to get the jolt/kick we all like for workouts.