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Called as arachidonic acid, ARA is an essential fatty acid for human body. As the composition of the cell, it is an essential substance of brain and nervous system, immune system, cardiovascular system and skin, which plays an important role in the improvement of infants’ intelligence and vision degree. During the infant period, as its own synthesis deficiency, ARA must be added in proper amount, which has now been a national compulsory standard. It has the essential biological activity of life body that other material does not possess, such as esterifing cholesterol, enhancing blood vessel elasticity, lowering blood viscosity and adjusting blood cell function and so on.