How would you wash your heart, liver or brain each day? The skin is an organ, like the heart, liver or brain. In fact, it is the largest organ in the body, and one of the most complex. In reality, the skin is an endocrine organ, a vital and integral part of the immune system itself. T cells, the master cells of the immune system, after passing through the thymus, migrate to the skin's surface where, amazingly, they receive maturation hormones from skin cells. Even tiny traces of chemicals can interfere with the skin cell's ability to produce these complex hormones which are vital for maintaining the immune system throughout our lives.