Aminolaevulinic acid, also known as ALA, is a naturally occurring organic compound that is essential for the production of heme, an important component of red blood cells. ALA is used in medicine to treat certain skin conditions, such as actinic keratosis and basal cell carcinoma, as well as photodynamic therapy for cancer treatment. Synonyms for aminolaevulinic acid include 5-Aminolevulinic acid, 5-ALA, Levulan, and Ameluz. These terms are often used interchangeably and refer to the same compound. Understanding these synonyms can provide clarity when researching or discussing the use of aminolaevulinic acid as a medical treatment.