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How much caffeine in ESP Pre-workout - Bestpreworkoutforwomen Nothing works better than tyrosine in this regard. In the ESP pre-workout, tyrosine is added in the N- acetyl-L-tyrosine form. 4-Choline. Important in neurotransmission, choline is an important ingredient of any pre-workout. In the ESP-pre-workout, it is added in the bitartrate form. This is a cheaper but still effective form of choline. Energy Stimulant Pre-Workout Supplement - Metabolic Nutrition Best ever! I've used every type and brand of pre-workout on the market, and the E.S.P Extreme is by far my favorite. Great taste, nice energy boost (with just the right amount tingly rush), and able to smash through long workouts. 10/10 would recommend. Share. Metabolic Nutrition E.S.P. Pre-Workout 300 Grams — Best Price Nutrition ESP is a customizable multi-strength pre-workout formula that delivers unrivaled intensity and energy*. Before using this formula, it is important to first assess your stimulant tolerance...