I am a manufactruer for brain health supplement in korea,and having concern about your products especially in Phosphatidylserine now, we are planning to produce new product by using PS as a primary ingredients.as you know , both USA and CHINA are main producing country for PS in the worldso we are trying to contact several company located in these two country.most of all, basic costing of PS is very important in whole pricebriefly speaking, how much does it latest price per kg with complying following descriptionif the price are appropriately, i willing to placed order within 3 months. Heavy Metals less than20ppmAs less than 2ppmE.Coli NegativeSalmonella NegativeAssay L-?-Phosphatidyl-L-serine more than 40%packing: 5kg per bag, total 25kgs in 5bags in one drum. let me know what&＃39;s your opinions about this ?thank you