Profile: Zhejiang Guoguang Biochemistry Co.,Ltd. is an ISO 9001 certified company. Our products are itaconic acid and L-Threonine. Our product L-Threonine is an analeptic, which fortifies cereal, pastry and dairy products. Like tryptophan, it rejuvenates human bodies and promotes the growth of infants. When applied in pharmaceutical field, threonine can moisten human skins due to the hydroxy in its structure. When combined with oligose, it protects human cell membranes & accelerates the synthesis of phosphatide & the oxidation of fatty acids.