I take it and yes, you have to build up to take increased strengths. I was off it for a while and took a 2.5-3 scoop load and was all fucked up. Jittery and shitting like mad plus sweating. Gotta be careful with this stuff. It does make a difference in the gym and when doing biceps my forearms feel like they are going to burst out of skin. A good product, but follow the directions precisely.
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