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alot of supplement have ingredients that can mess up your testosterone which makes you less confident or nervous, or more aggressive..........honestly i stay clear from preworkouts and just eat a banana or an orange before workouts and i seem to have almost the same amount of energy......now u might need to be drinking more water also or maybe its just something you saw about your self that made you nervous ....maybe you saw a pimple that you hate but you forgot was there, your part of your mind is still insecure about it and the other part forgot about it.......idk lol
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i think its my pre workout, raises natural tess levels... ahh thanks broth