Handmade soap has natural glycerin. Glycerin attracts moisture to your skin. Glycerin is a natural by-product of the soapmaking process and handcrafted soap retains glycerin in each and every bar.
 
Soap is made out of fats and lye. The fats already contain glycerin as part of their chemical makeup(vegetable fat contains from7% to 13% glycerin). When fat and lye interacts, Soap is formed and the glycerin is left out as by-product.But while its chemically seperate, its still blended into the soap mix