The Soap that grows on Trees ® Soap Nuts come from the Sapindus mukorossi, a tree grown in India. Soap nuts are not real nuts, they are non-edible fruits extracted from their shells, which are then dried. It is the shells that contain saponins - substances that act as a mild and natural detergent with cleaning propertie.
Saponin is a natural non-ionic surfactant, which when dissolved in water acts as a mild and natural detergent with cleaning properties. Soap Nuts are hypoallergenic and entirely vegetable in nature.