TYROSINE is a nonessential amino acid found naturally in the body. Since TYROSINE is a direct precursor to the neurotransmitters dopamine, norepinephrine and epinephrine, nearly 90% of them are synthesized from TYROSINE directly. Studies show that when these brain neurotransmitter levels decrease there is also a decrease in performance. In this case TYROSINE supplementation can restore norepinephrine levels, thus there is an increase in performance. Taking 2 grams of pure TYROSINE before workouts or whenever you feel tired can significantly boost training performance. Thanks to Scitec Nutrition’s 3-WAY TESTING SYSTEM it is one of the highest quality sport supplements available.