Studies Needed To Show L-phenylalanine Helps Repigmentation
Evidence suggests that combining L-phenylalanine (oral and topical) with UVA radiation for people with vitiligo (a condition characterized by irregular depigmentation or white patches of skin) may lead to some darkening or repigmentation of the whitened areas, particularly on the face. Although preliminary information suggests that it is safe when used under appropriate medical guidance and supervision, more research is needed to assess potential side effects of this treatment approach. Dietary Sources L-phenylalanine is found in most foods that contain protein such as beef, poultry, pork, fish, milk, yogurt, eggs, cheese, soy products (including soy protein isolate, soybean flour, and tofu), and certain nuts and seeds. The artificial sweetener aspartame is also high in phenylalanine. D-phenylalanine is synthesized in the laboratory is not found in food.