GNC L-Tyrosine 500Mg Supports Normal, Healthy Nervous System Activity. Tyrosine Is A Non-Essential Amino Acid That Can Be Synthesized By The Body Amino Acids Are The Building Blocks Of Protein And Help Fuel Skeletal Muscles Each Tablet Contains 500 Mg Of Free-Form Tyrosine Kosher And Vegetarian | GNC Lhealthy -Tyrosine 500Mg Healthy - 60 Vegetarian Caplets (60 Servings)