Various health products are sold on the market at present. How can we choose a health product which has no side effects and a wholesome product on disease? DHA (omega-3:7, 10, 13, 16, 19-docosahexaenoic acid) as a kind of polyunsaturated fatty acids, can across the blood-brain barrier, which are the important raw material for the formation of cerebral cortex neuron membrane and could improve human cognitive function and reduce the occurrence of Alzheimer's disease and depression. Method: This

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... per summarizes the research of DHA in foreign countries in recent years. Result and Conclusion: The development and utilization of DHA has been paid attention and concerned by all countries in the world. DHA can prevent and improve mental illnesses and neurodegenerative diseases. Choosing DHA as a health supplement is a wise choice.