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Description Description N-Acetyl-L-Tyrosine with Biopterine Dietary Supplement Norival is a scientifically-designed supplement containing a special form of the amino acid L-tyrosine in conjunction with the rare nutrient Biopterin.Supplement FactsSupplement FactsServing Size: 1 CapsuleServings per Container: 60 Amount Per Serving % Daily Value* Vitamin B6 10 mg 500% N-Acetyl L-Tyrosine 300 mg ** Biopterin 25 mcg ** * Percent Daily Values are based on a 2000 calorie diet. ** Daily Value not established.Other IngredientsCellulose, gelatin, magnesium stearate and silicon dioxide.DirectionsTake one or two capsules daily, or as directed by a physician.