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。
The vitamin D artificially synthesized and added to milk is useless to crystalline biology and it is best perhaps therefore to avoid this substance as it is a toxin. 人工合成它并加到牛奶里对水晶生物体是没用的，因此或许最好去避免这类物质，因为它是毒素。
