Hydroxymethylglutaryl CoA Reductase NAD Dependent is an enzyme involved in the synthesis of cholesterol, an essential component of cell membranes. Its complex name may be a tongue-twister, but it has a few synonyms that simplify its identification. Some of these include HMG-CoA reductase, cholesterol synthase, and 3-hydroxy-3-methylglutaryl CoA reductase. These synonyms are commonly used in scientific research papers, medical literature, and drug development studies. By using these more accessible terms, researchers and medical professionals can effectively communicate and understand the vital role this enzyme plays in cholesterol metabolism.