L-Phenylalanine is an essential amino acid, meaning it cannot be made by the body and must be obtained from food. As an amino acid, L-Phenylalanine provides the building blocks for protein, which is needed for the body’s normal growth and development. This product is suitable for vegan and kosher diets. Solgar DLPA DL-Phenylalanine 500mg is available in bottles of 50 vegetable capsules.Ingredients:DL-Phenylalanine - 500mg. (Providing 250mg of D-Phenylalanine and 250mg L-Phenylalanine). Natural Ingredients:Magnesium stearate, silicon dioxide, hydroxypropyl cellulose. Capsule shell: Hydroxypropylmethyl cellulose. Directions:As a food supplement for adults, one (1) to two (2) vegetable capsules daily with juice or water in bteween meals, or as directed by a healthcare practitioner. Please Note:DLPA is not intended for use during pregnancy or lactation or for those with high blood pressure. Caution:PHYLKETONURICS (PKU) - Solgar DLPA DL-Phenylalanine 500mg containt Phenylalanine.