Abstract: A composition comprising in the range of from 1 to 20% by weight of the total composition of an oil extracted from the seeds of Borignaceae, particularly E, plantagineum, has particular advantages over oils extracted from other seeds. The oil comprises in the range of from 5 to at least 20% stearidonic acid triglyceride and 80 or less to 95% other fatty acid triglycerides, by weight of the total fatty acids in the oil extract, which stearidonic acid or other fatty acid(s) may optionally have been converted to a derivative thereof, and optionally a physiologically acceptable carrier therefor. The compositions are particularly suited for oral or topical administration and are for dietary, cosmetic, pharmaceutical and healthcare use.