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Optimum Nutrition Essential Amin.o. Each serving provides 100 mg of caffeine from natural sources to support energy and focus along with 5 grams of amino acids for muscle support. Do not combine with alcohol.

Optimum Nutrition Essential Amin.o. Each serving provides 100 mg of caffeine from natural sources to support energy and focus along with 5 grams of amino acids for muscle support. Do not combine with alcohol.