Provided herein is technology relating to lipid compositions containing bioactive fatty acids and particularly, but not exclusively, to compositions containing defined ratios of 5,11,14-eicosatrienoic acid to one or more of: 5,9,12-octadecatrienoic acid 7,11,14-eicosatrienoic acid 5,8,11,14-eicosatetraenoic acid 9,12-octadecadienoic acid 9-octadecenoic acid 14-methyl hexadecanoic acid 11,14 eicosadienoic acid, 5,9-octadecadienoic acid 5,11-octadecadienoic acid 9,12,15-octadecatrienoic acid 5,8,11,14,17-eicosapentaenoic acid 7,10,13,16,19-docosapentaenoic acid and 4,7,10,13,16,19-docosahexaenoic acid.
