8(Z),14(Z)-Eicosadienoic Acid, an ω-8 C20:2 fatty acid, constitutes 0.19% of total fatty acids in human milk. In vivo, it is converted by desaturases into eicosatrienoic acids, known for their potent vasodilator properties. However, the physiological effects of 8(Z),14(Z)-Eicosadienoic Acid remain unexplored.