All-cis-5,8,11,14,17-icosapentaenoic acid is an icosapentaenoic acid having five cis-double bonds at positions 5, 8, 11, 14 and 17. It has a role as a micronutrient, an antidepressant, an antineoplastic agent, an anticholesteremic drug, a nutraceutical, a mouse metabolite, a fungal metabolite and a Daphnia galeata metabolite. It is an omega-3 fatty acid and an icosapentaenoic acid. It is a conjugate acid of an all-cis-5,8,11,14,17-icosapentaenoate.