An object of the present invention is to provide a non-peptidic nerve axon and/or neurite outgrowth agent for allowing a nerve axon and a neurite to elongate. 3-(Aminocarbonyl)-1-[5-O-[[1-(6-amino-9H-purin-9-yl)-1-deoxy-β-D-ribofuranos-5-O-yl]phosphonyloxy(oxylato)phosphinyl]-β-L-ribofuranosyl]pyridinium that is an analogue of nicotinamide adenine dinucleotide (NAD) comprising β-L-ribose as the sugar component is used as a nerve axon and/or neurite outgrowth agent or composition, a cancer cell growth suppressing and/or apoptosis inducing agent, or a cancer cell growth suppressing and/or apoptosis inducing composition.