CYP19A1, also known as aromatase, is an enzyme that facilitates the conversion of androgens (such as testosterone) into estrogens (such as estradiol). This enzyme plays a key role in oestrogen biosynthesis, which is essential for sexual development, reproduction, bone metabolism, and cardiovascular health. CYP19A1 is expressed in multiple tissues, including the ovaries, testes, placenta, adipose tissue, and brain. In females, it is primarily responsible for producing oestrogen in the ovaries by converting androgens from the adrenal glands.