Jaundice occurs when there is a build-up of a naturally occurring substance in the blood called bilirubin.

当一种名曰胆红素的物质在血液中累积时，会出现黄疸。

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A naturally occurring substance found in plants, animals and humans, squalene is synthesized in the liver and circulates in the human bloodstream.

角鲨烯是一种存在于植物、动物和人体中的天然物质，在人体肝脏内合成，并随血流循环。

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Squalene is a naturally occurring substance found in plants, animals, and humans. It is manufactured in the liver of every human body and circulates in our bloodstream.

角鲨烯是一种存在于植物、动物和人体中的天然物质，在人体肝脏内合成，并随血流循环。

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Growth hormone is a naturally occurring substance secreted by the brain that helps guide growth in childhood and maintain muscle mass during adulthood.

FORBES: Sweet syringe of youth