Supports mental alertness Supports neurotransmitter production Supports brain function Free of gluten, dairy, soy, and nuts Supporting the sharpness of your mind is just as important as maintaining the strength of your body. L-tyrosine is a free form amino acid that can be converted into norepinephrine and dopamine in the brain?two compounds that can support mental alertness, brain function, and energy. The Vitamin Shoppe? brand L-Tyrosine capsules are a convenient, once-daily solution to help you flex your mental muscles.