Natural Factors L-Tyrosine - Natural Factors L-Tyrosine provides a higher dose of this free-form amino acid in a convenient powder form. L-tyrosine is a non-essential amino acid that helps decrease cognitive fatigue resulting from physically stressful situations, such as extended wakefulness, exposure to cold, and excessive noise. Each neutral-tasting vegan powder scoop contains 5 g of L-tyrosine, providing 10 g with two daily doses. It is non-GMO and contains no flavours, sweeteners, or fillers.