The present disclosure relates to the use of inositol-stabilized arginine ("ASI") for improving cognition. For example, in some implementations, methods include administering an amount of ASI effective to improve cognition in humans. Some embodiments include the use of ASI for improving mental focus and/or attention span. For example, in some implementations, methods include administering an amount of ASI effective to improve mental focus and/or attention span in humans. Some embodiments include the use of ASI for treating and/or preventing cognitive disorders. Cognitive disorders may include stroke, anoxic brain injury, traumatic brain injury, dementia, Alzheimer's disease, Parkinson's disease, MCI, and age-related memory loss, attention deficit hyperactivity disorder ("ADHD"), and other learning disabilities.