DL-Phenylalanine. Free Form Amino Acid. Dietary Supplement. TWINLAB DLPA CAPSULES ARE EASY TO SWALLOW AND MORE BIOAVAILABEL. Well tolerated by highly allergic individuals. No tablet binders, coatings or colorings. No added corn, soy, yeast, rice, barley, wheat, lactose (milk sugar, and all milk, citrus, fish, egg products, flavorings, salt, artificial sweeteners, colorings, preservatives or salicylates. This product is manufactured at our own state-of-the-art facility. Twinlab DLPA is 50/50 (equimolar) mixture of D-Phenylalanine and L-Phenylalanine.