Dietary Supplement. DL-Phenylalanine. Free Form Amino Acid. DLPA (DL-Phenylalanine) is an amino acid. TwinLab DLPA is a 50/50 (equimolar) mixture of D-Phenylalanine and L-Phenylalanine. TwinLab DLPA Capsules are easier to swallow and assimilate. Well tolerated by the most highly allergic individuals. No tablet binder, coatings or colorings. Free of the most common allergens such as corn, soy, yeast, rice, barley, wheat, lactose (milk sugar) and all milk, citrus, fish and egg products. No added flavorings, sugars, salt, artificial sweeteners, colorings, preservatives or salicylates. This product is manufactured at our own state-of-the-art facility.