Linoleic acid (LA) is a polyunsaturated fatty acid of the omega-6 family. Linoleic acid cannot be synthesised by the body. It is found in large quantities in vegetable oils, particularly grapeseed, sunflower, borage and walnut oil.
Linoleic acid has the distinction of being the only essential omega-6 fatty acid.
Its small size makes it a precursor of the other omega-6s synthesised from this molecule.