jizhou city Huaheng biological tech co; ltd. we are the manufacture of amino acid, which includes the glycine DL-alanine and L-alanine, DL-methionine, L-Lysine HCL, L-Threonine, L-Cysteine, L-Cystine, L-Cysteine hydrochloride anhydrous, L-Cysteine hydrochloride monohydrate etc, we can promise you the quality