Skin is a soft outer covering of an animal. It is the largest organ of the human body.
Two billion to 3 billion skin cells are shed daily. The body expends this effort to replace skin every month because the skin constitutes the first line of defense against dehydration, infection, injuries and temperature extremes. Skin cells can detoxify harmful substances with many of the same enzymatic processes the liver uses. The unbroken surface also prevents infectious organisms from penetrating into systemic circulation. As gatekeeper, the skin absorbs and uses nutrients applied topically. Because it cannot completely discriminate, the skin may absorb the synthetic chemicals often present in soaps and lotions and other skin care products, which at best it has no use for and at worst can be toxic or irritating.
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