The National Library of Medicine, the world's largest medical library and a component of the National Institutes of Health, has formally launched MedlinePlus Connect. This free service allows health organizations and health information technology providers to link patient portals and electronic health record systems to MedlinePlus.gov, a trusted source of authoritative, up-to-date health information for patients, families and health care providers. MedlinePlus brings together information from NIH, other federal agencies, and reputable health information providers. MedlinePlus covers a wide range of health conditions and wellness issues, and includes key resources to inform patients about their health. Patients using portals or EHRs that have implemented MedlinePlus Connect can access easy-to-understand health information on MedlinePlus that is directly related to their diagnoses, medications, and lab tests.