From the process of the production of glutathione, there are mainly extraction, chemical synthesis, microorganism zymotechnics and chemical enzymatic synthesis. 但由於直接從茶葉中提取高純度茶氨酸的成本比較高昂，茶氨酸的人工合成，特別是微生物發酵合成方法一直是人們研究的熱點。
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. 人工合成它並加到牛奶里對水晶生物體是沒用的，因此或許最好去避免這類物質，因為它是毒素。
