This is as natural as laundry detergent gets. Soap nuts are actually the dried husk of the Soap Berry. They contain saponin, a natural surfactant (a.k.a. soap!) that is much gentler and milder than manufactured detergent. Soap nuts produce minimal suds and are OK to use in HE (high efficiency) washers. They are nut allergy safe, gentle on babies’ clothing and cloth diapers, and good for sensitive skin. Length of use varies widely depending on water temperature, water hardness and the rinse cycles of your washer.