Lamberts® Phenylalanine is the natural L-Phenylalanine and is presented in its free-form to help ensure optimal absorption. This product is made in the UK to pharmaceutical GMP standards. Please Note: People with a condition known as phenylketonuria (PKU), in which phenylalanine cannot be broken down, should not take phenylalanine supplements. Nor should phenylalanine supplements be taken in conjunction with prescription anti-depressants, particularly monoamine oxidase (MAO) inhibitors. Each capsule delivers: L-Phenylalanine 500mg Encapsulated with: Capsule Shell (Gelatin), Cellulose, Magnesium Stearate, Silicon Dioxide. Disintegration Time Less than 30 minutes. Allergen AdviceThe following list of allergens are excluded: Wheat, Gluten, Barley, Soya, Eggs, Milk and milk products, Lactose, Nuts, Sulphites, Celery, Fish, Shellfish and Yeast.CautionsL-PHENYLALANINE MUST NOT BE TAKEN BY PHENYLKETONURIA SUFFERERS (PKU). L-Phenylalanine should not be used with MAO inhibitors (a type of anti-depressant medicine). This product is not recommended for children, or pregnant or lactating women.