Benefits of Renew Glutathione Skin Whitening Soap Here are some benefits of the soap – It improves the skin complexion quickly and effectively. It controls the moisture level of the skin. It also works as a good toner for the skin. It reduces all aging signs from the skin. It reduces pimples and acnes permanently. Process of using Renew Glutathione Skin Whitening Soap. It can be used as any other soap while bathing once daily. However,on face, it could be applied twice daily withlukewarm water.