Psoralen is a naturally occurring compound found in various plants, particularly in the Apiaceae family, such as celery and parsley. It is a furanocoumarin that has been used in phototherapy for skin conditions like psoriasis and vitiligo due to its ability to sensitize skin to ultraviolet light. Psoralen exhibits a range of biological activities, including anti-inflammatory and antimicrobial properties. In culinary contexts, it is present in certain spices and can contribute to flavor and aroma, although its use is limited due to potential toxicity. Psoralen can also form covalent bonds with DNA upon UV exposure, which is a mechanism utilized in therapeutic applications. However, it is important to handle it with care due to its potential health risks.