Fenadul capsules help regenerate spots caused by vitiligo by repigmenting the skin. Depigmented skin should be cared for both externally, with specific topical preparations, and internally, through the intake of dietary supplements that complement a varied diet. The Fenadul Line includes oral and topical photosensitizing products that provide depigmented skin with the essential amino acid L-Phenylalanine, which is essential in the treatment of vitiligo. L-Phenylalanine is one of the components necessary for the formation of melanin. An extra dose of this component can encourage melanocytes to produce more pigment in people with skin pigmentation problems. It can be used for the treatment of vitiligo in combination with both natural and artificial sun exposure (ultraviolet rays). Phenylalanine is not phototoxic, has no significant side effects, and induces tolerance to sun exposure in depigmented areas that usually tend to burn, thus allowing its use in pediatric patients.