Soap nuts are the fruits of the soap nut tree that grows in India and the Himalayan region. The outer shell of the soap nut contains a soapy substance – saponins - that turns into a magnificent natural detergent when immersed in water. It is much more gentle on the skin than chemical detergents, and there are no reported cases of allergic reactions. In ancient India, these fruits were used for soap, hair wash powders and the laundering of fine silks, wools and linens. In traditional Indian ayurvedic medicine, soap nuts belong to the three most beneficial fruits. They are used for the treatment of eczema, psoriasis and severe lung congestions. Ancient Indian therapies utilize soap nut powder extensively, for example to eliminate freckles and cracks in the skin.