ProLipid

... and HDL is good.

As you can see in this article, LDL (or HDL) cholesterol are actually indicators of how many LDL and HDL 'particles' are present in the blood.

This is the function of LDL and HDL particles:

Normal Cholesterol Levels:

LDL particles in the bloodstream deliver cholesterol to tissue cells. Excess cholesterol is absorbed by HDL particles and returned to the liver for reprocessing or elimination.

Elevated Cholesterol Levels:

When blood levels of "bad" LDL cholesterol are too high, cholesterol is often deposited as "plaques" in the artery walls. Thes plaques are the first step of atherosclerosis, which will lead to a hardening of the artery walls which in turn can eventually lead to heart disease.

HDL particles can absorb some of the cholesterol from artery walls. Therefore, a high level of "good" HDL cholesterol (which indicates the presence of many HDL particles) can actually slow the progression of atherosclerosis.