There are times when you want a hefty dose of caffeine for pre-workout performance. But on other occasions, like first thing in the morning or a late afternoon pick-me-up, what you?d get from a cup of coffee is more appropriate. ON?s Essential Amino Energy offers the best of both with a formula that delivers 100mg of caffeine from natural sources per 2-scoop serving. Decrease or increase the energy level as the occasion demands. Each serving provides 5 grams of micronized amino acids.