Smart-drug meaning

Any of a variety of substances, including certain vitamins, herbs, and prescription drugs, reputed to improve such mental functions as memory and alertness or to lessen or prevent damage to brain cells.
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A substance, as a legal drug, botanical, vitamin, or mineral, believed by some to enhance a person's memory, concentration, and general cognitive ability.
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A drug or other substance that improves or enhances cognitive function; a nootropic agent.
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