I have two in mind that are really good, one is from a company called Genomyx and the other is from a company called Metabolic Nutrition. The Product is called Stimaholic, it tastes great and is a great pre-workout for someone who is looking for a good pick me up. And the 2nd is called ESP. This preworkout is extremely strong and contains somewhere in the neighborhood of 400mg of caffeine along side of amp citrate, if you are looking to stay up well past after getting done with the gym then this is your product.

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