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What is urea and how is it used in skin care? Urea is a naturally occurring nitrogen crystal. Urea is the product of protein degradation in the human body, produced by the liver and excreted through the kidneys. Urea is...

What is the meaning of natural? What is the meaning of 'natural' when you see it on a product label? When I buy a product - especially food - I look for the word natural, along with the word organic....