组氨酸是生物体蛋白质合成的必需氨基酸，其生物合成途径已得到广泛的鉴定。
Histidine is one of the essential amino acids for protein synthesis and is required by all living organisms. Its biosynthetic pathway has been extensively characterized.
左旋肉碱是一种非必需氨基酸，它是由肝脏中的其它氨基酸产生的，它没有经由过程膳食直接获取的途径。
Carnitine is a nonessential amino acid, which means that it is manufactured from other amino acids in the liver; and it does not have to be obtained directly through the diet.
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