From the process of the production of glutathione, there are mainly extraction, chemical synthesis, microorganism zymotechnics and chemical enzymatic synthesis.

• 但由于直接从茶叶中提取高纯度茶氨酸的成本比较高昂，茶氨酸的人工合成，特别是微生物发酵合成方法一直是人们研究的热点。