"PS" is PhosphatidylSerine (Phosphatidylserine); there is a cell biologist Vision called "a way to save memory and brain function," single best material.

Phospholipid membranes composed mainly of three, respectively, acyl choline phospholipids (phosphatidylcholine), phospholipid acyl ethanolamine (phosphatidylethanolamine) and phospholipid acyl serine (phosphatidylserine, PS); they are hydrophilic outer end, including the way the hydrophobic end, forming a phospholipid bilayer, constitute the cell membrane. In normal cell membranes, PS only distributed in the inner layer of phospholipid bilayer, but once senescence, this asymmetry membrane immediately disappear, PS will go to the outer membrane phospholipids, thereby changing the cell mobility.

Human memory because of cerebral cortical cells mobility (fluidity) good or bad change; older people, the brain cell membrane fluidity will slowly deteriorate, memory will gradually decline. Memory can be divided into long-range memory (long-term memory) and short memory (short-term memory), medical study found decreased brain cell membrane fluidity and a short memory will be of particular relevance to the recession 
PhosphatidylSerine(Phosphatidylserine) has been shown to increase the concentration of brain cell membrane fluidity and brain cells of glucose, it also mean that it can make brain cells more active, to enhance the short-memory (eg for examinations) clear and significant effect increased learning ability and academic performance; in addition, the cell membrane with enhanced resistance against destructive free radicals, reducing the chances of cellular aging cell degeneration causes deterioration of liquidity.
PhosphatidylSerine (Phosphatidylserine) has been shown to increase the concentration of brain cell membrane fluidity and brain cells of glucose, it also mean that it can make brain cells more active, to enhance the short-memory (eg for examinations) the effect of clear and significantly increase the learning ability and academic performance; in addition, the cell membrane with enhanced resistance against destructive free radicals, reducing the chances of cellular aging cell degeneration causes deterioration of liquidity.