Information Reviews Ask Dr. Dan Product Description DaVinci Laboratories DL-Phenylalanine supports comfort and proper mood balance. Recommended Use: Take 1 capsule with a meal, or as directed by a healthcare professional. Label Information Davinci Laboratories DL-Phenylalanine Facts: 1 capsule contains: DL-Phenylalanine 750 mg Other Ingredients: vegetable cellulose, vegetarian leucine, silicon dioxide.