Nanchang Polis Bio-Tech Co., Ltd., located in Gaoxin Dist. of Nanchang, Jiangxi, China, is a professional manufacturer and supplier engaged in the R & D, manufacture and sales of amino acids and derivatives. Our product concludes:L-CitrullineL-proline L-Cystine(AJI92) L-Tert-LeucineLThioproline D-Tryptophan DL-Cysteine hcl Monohydrate N-AcetylLthioproline Magnesium Orotate Potassium Orotate CBZ-L-PhenylalanineBOC-L-Valine L-Serinol welcome to www.polisbiotech.com.with competitive price and good quality,they are best choose for you