ApoC-I, or Apolipoprotein C-I, is a protein that plays a crucial role in lipid metabolism. It is primarily found in the bloodstream and is associated with lipoproteins, which are particles that transport fats and cholesterol throughout the body. ApoC-I helps regulate the levels of triglycerides and cholesterol, contributing to overall cardiovascular health. This protein is produced mainly in the liver and intestines. It interacts with various enzymes and receptors involved in lipid processing, influencing how fats are absorbed and utilized. Abnormal levels of ApoC-I can be linked to metabolic disorders, highlighting its importance in maintaining healthy lipid levels.