Vaccenic acid is a type of trans-fatty acid primarily found in dairy and meat products. It is an unsaturated fatty acid and is also known as trans-vaccenic acid. Other synonyms for vaccenic acid are trans-11-octadecenoic acid or C18:1trans-11. This acid is essential for the human body as it promotes cardiovascular health, helps in brain development, and reduces inflammation. Vaccenic acid is converted into conjugated linoleic acid (CLA) in the body, which is known for its anti-cancer and anti-inflammatory properties. CLA is also believed to promote weight loss and improve cholesterol levels. The term "vaccenic acid" is commonly used in scientific research papers and nutritional studies.