NIH National Heart, Lung, and Blood Institute — blood cholesterol overview

This is a health-information overview, not a new study with enrolled participants. It explains cholesterol, a waxy substance the body needs, and lipoproteins, particles that carry it through the blood. LDL cholesterol, often called bad cholesterol, can build up in artery walls, while HDL cholesterol, often called good cholesterol, helps carry cholesterol away. The overview also discusses blood tests, healthy eating, physical activity, weight, and medicines that can lower harmful cholesterol levels.

What this means for you: Use this as general guidance, not as a reason to buy a specific supplement or product. Ask a health professional about your cholesterol numbers and overall heart risk before changing medicines or treatment.