L-Phenylalanine by Now Foods Potency 500 mg Size 60 Caps Retail Price $7.99 Our Price $4.79 SKU # 130 Product ID # 23585 You Save 41% Buy Now! Description of L-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.   Ingredients of L-Phenylalanine Supplement Facts Serving Size: 1 Capsule Ingredients Amount %DV L-Phenylalanine 500 mg * Other Ingredients: Gelatin (capsule). Free of: sugar, salt, starch, yeast, wheat, gluten, corn, soy, egg, milk or preservatives. * Percent Daily Values are based on 2,000 calorie diet.   Suggested Use for L-Phenylalanine As a dietary supplement, take 1 capsule, 1 to 3 times a day as needed, preferably between meals.   Warning for L-Phenylalanine Persons with high blood pressure should consult a physician before using.