Used in photochemotherapy (PUVA therapy) for skin disorders like psoriasis, vitiligo, and eczema. It sensitizes the skin to ultraviolet A (UVA) light, helping to slow down rapid skin cell growth and repigment affected areas. Also found in some plant extracts used in tanning activators, though this use carries risk of skin damage if not properly controlled. Investigated for potential antiviral and anticancer properties due to its ability to intercalate DNA and form crosslinks upon UVA exposure.