The present invention is directed to a method of delivering agmatine to a human for medicinal treatment, which includes: a.) providing a spray dispenser with an agmatine solution containing agmatine in a liquid carrier, the spray dispenser having a dispensing nozzle and, b.) positioning the dispensing nozzle of the spray dispenser adjacent a nasal cavity of the human and spraying an effective amount of the agmatine solution into the nasal cavity so as to penetrate an olfactory area of the human.
