Cholesterol esters are a storage form of cholesterol that must be de-esterified to free cholesterol for use in hormone synthesis, bile acid production, or cell membranes.

“so the active form of cholesterol that can be changed into a hormone a bile salt or function in a cell membrane becomes a storage form of cholesterol or a lipid core transportable form of cholesterol called cholesterol now it's yl it's not Oh L ester and we abbreviate that as C II so free cholesterol is either gonna be abbreviated as a C or an FC and cholesterol ester and it's very difficult if I wanted to if I'm an adrenal gland and I got some cholesterol ester stored and I want to make a hormone because I need Questor I have to dias terrify that cholesterol ester to free cholesterol if the liver has cholesterol ester storage pools and it does and it wants to make a bile acid it has the dias terrify cholesterol ester cholesterol is stored in huge quantities in fat cells as cholesterol ester and it would have to be the esterified to be utilized to do something else or so”