Common dietary supplements for cognitive health.

Advancing age is a major risk factor for cognitive impairment and dementia. Currently, there are no effective preventive strategies for cognitive decline. Since physicians have no drug therapies to offer, patients and families may turn to complementary and alternative medicine to preserve cognition. Dietary supplements are one of the most common forms of complementary and alternative medicine that patients use and although limited, evidence for their potential interactions with other treatments has been documented. Considering the insufficient evidence for their efficacy, potential for interaction with other therapies and costs to patients, physicians should be aware of the use of dietary supplements among their patients so that they can advise their patients on the potential benefits and harms.