求翻译：请输入您需要翻译的文本！左旋肉碱作为一种人体必需的营养素，对人体有诸多的作用，例如减肥、抗衰老等，本文通过对左旋肉碱的概况的阐述来简单描述一下左旋肉碱对人体的作用。是什么意思？

L-carnitine as a body essential nutrients, many of the role of the human body, such as weight loss, anti-aging, this article through the elaboration of an overview of L-carnitine to briefly describe the role of L-carnitine on the human body.

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Effects of l-carnitine an essential nutrient, on the human body has many effects, such as weight loss, anti-aging, through survey of the effect of l-carnitine on this article for a simple description of l-carnitine on the function of the human body.

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