PRODUCT SEARCH SHOP BY BRAND Select a Brand 4Ever-Fit AST Sports Science Ageless Foundation Agrolabs Alacer Corp. Alba Botanica Almased Always Young American Biosciences American Bodybuilding American Nutrition Products Amerifit Nutrition Amino Vital AminoGenesis Ark Naturals Avalon Organics Axis Labs BNG Enterprises BSN Bask in the Sun Biocentric Labs Biotest CMI Champion Nutrition chefjays Clearly Natural Products Clif Bars Cognitive Nutrition Colorado Nutrition Controlled Labs Country Comfort Craig Nutraceuticals Cytodyne Cytosport Derma e Doctor's Best Dymatize Dynamic Health Laboratories EAS Genesis Nutrition HI-TECH Pharmaceuticals Health Plus Heaven and Earth Herbatint IDS ISS Immudyne Immune Tree Instone Jason Natural Products Kirkman LG Sciences Labrada Bodybuilding Lane Labs Langel Liddell Lidtke Life Solutions Life Source Basics Long Life Services MacroLife Naturals Maximum Human Performance Mega-Pro Merix Pharmaceutical Corp Met-Rx USA Metabolic Response Modifiers Muscle Marketing USA Muscle-Tech Mushroom Science NOW Foods NanoSynergy Worldwide Natrol Natural Nutrition Center Natural Orthopaedic Solutions Natural Vitality Naturally Vitamins Products Nature's Answer Nature's Best Nature's Herbs NutraceuticsRx Nutrex Research Ocean Blue Nutritionals Optimum Nutrition Performance Brands Pet Naturals Pharmagenx pHion Physician Formulas Pinnacle Planetary Formulas Polycil Health Products Primaforce ProNatura Prolab Pure Essence Labs Quality of Life Labs Rain-Tree Nutrition Renew Life Ridgecrest Herbals S.A.N. Sante Active Sedona Labs Similasan Sopharma Source Naturals Sports Performance StarChem Terra Ceutics Thermolife International Tribest Trimedica Twin Labs UltimateNutrition UltraLab Universal Nutrition VirtuVites Wakunaga/Kyolic Waterwise World Nutrition DEPARTMENTS Amino Acids Anti-Aging Anti-Oxidants Baby Health Bath & Body Bodybuilding & Sports Bone & Joint Books & Literature Brain & Memory Bulk Powders Clearance Cholesterol Circulation & Heart Cold & Flu Detoxification Digestive & Body Cleansing Enzymes Energy Eye Health Green Supplements Herbs Immune System Juicing Laxatives/Fiber Men's Health New Products Nutritional Oils Pet Nutrition Senior Health Sexual Health Skin Care Sleep & Relaxation Sprouting Stress & Mood Super Fruits Vitamins & Minerals Weight Loss Water Purification Women's Health   Amino Acids: Phenylalanine L-Phenylalanine is an essential, nine-carbon amino acid and is a precursor to the amino acid tyrosine. Because tyrosine is necessary for the synthesis of proteins and the production of the neurotransmitters dopamine and norepinephrine, phenylalanine is an extremely important nutrient that must be obtained through the diet or supplementation. Best Selling Amino Acids: Phenylalanine Supplements Amino Acids: Phenylalanine Pages: NF L-Phenylalanine 500 mg - 120 Caps $14.99 $9.74 Our Price NF0132 Click on Product image for more information and Quantity Price Discounts Quantity    NF L-Phenylalanine 500 mg - 60 Caps $7.99 $5.19 Our Price NF0130 Click on Product image for more information and Quantity Price Discounts Quantity    SN DL Phenylalanine DLPA 120 tabs 375mg $18.50 $12.64 Our Price SN0163 Click on Product image for more information and Quantity Price Discounts Quantity    SN DL Phenylalanine DLPA 30 tabs 750mg $9.50 $6.49 Our Price SN0164 Click on Product image for more information and Quantity Price Discounts Quantity    SN DL Phenylalanine DLPA 60 tabs 375mg $9.98 $6.82 Our Price SN0162 Click on Product image for more information and Quantity Price Discounts Quantity    SN DL Phenylalanine DLPA 60 tabs 750mg $17.98 $12.29 Our Price SN0165 Click on Product image for more information and Quantity Price Discounts Quantity    SN L-Phenylalanine 100 tabs 500 mg $13.75 $7.83 Our Price SN0161 Click on Product image for more information and Quantity Price Discounts Quantity    SN L-Phenylalanine 3.53 oz powder 100 grams $28.98 $19.79 Our Price SN0158 Click on Product image for more information and Quantity Price Discounts Quantity    SN L-Phenylalanine 50 tabs 500 mg $7.25 $4.14 Our Price SN0160 Click on Product image for more information and Quantity Price Discounts Quantity    Amino Acids: Phenylalanine Pages: