Xanthotoxin, also known as 8-Methoxypsoralen, is a furanocoumarin compound found in various plants, particularly in the Apiaceae family, such as celery and parsley. It is known for its role in phototherapy for skin conditions like psoriasis and vitiligo, where it is used in combination with UVA light to enhance skin pigmentation. Xanthotoxin exhibits a characteristic bitter taste and has been studied for its potential health benefits, including anti-inflammatory and anticancer properties. However, it is also associated with photosensitivity, which can lead to skin reactions upon exposure to sunlight. Its presence in food can contribute to both flavor and potential health risks.