The invention provides methods for enhancing neurogenesis in an animal. In one embodiment, a method for enhancing neurogenesis in an animal can comprise identifying an animal that is suffering from cognitive decline, that is at risk of becoming cognitively impaired, that is diagnosed with a disease, disorder, or other condition that affects its cognitive abilities, or that is at risk of contracting a disease, disorder, or other condition that affects its cognitive abilities, and administering a composition comprising an unsaturated fatty acid (UFA), a nitric oxide releasing compound (NORC), a B vitamin, and an antioxidant, to the animal, wherein the composition is administered in an amount effective for enhancing neurogenesis in the animal.
