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As part of the National Institutes of Health (NIH), the National Institute of Mental Health (NIMH) is a segment of the U.S. Department of Health and Human Services (HHS). NIMH uses research to improve the understanding of mental health disorders.
"The Substance Abuse and Mental Health Services Administration (SAMHSA) is the agency within the U.S. Department of Health and Human Services that leads public health efforts to advance the behavioral health of the nation. SAMHSA's mission is to reduce the impact of substance abuse and mental illness on America's communities."