PURPOSE: A pharmaceutical composition or health food containing Dictyota coriacea extract is provided to improve learning and space perception ability. CONSTITUTION: A pharmaceutical composition for preventing and treating Alzheimer dementia contains water and ethanol mixture extract of Dictyota coriacea as an active ingredient. A health food for preventing and treating Alzheimer dementia contains the extract as an active ingredient. The extract is isolated using water, low alcohol of C1-C4, or mixture solvent thereof. A health food for preventing and treating amnesia and neurodegenerative diseases contains the extract as an active ingredient.
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