Use benzoin in its powdered form. Borax , a mineral which contains sodium, is valued in cosmetics for its ability to soften and disinfect the skin. The sodium in high concentrations of borax may curdle your soap, however, so use this mineral sparingly. Bran is the broken outer husk of any grain and acts as a mild abrasive in facial soaps. You'll find bran at health-food or grocery stores.
Buttermilk is the sour liquid left after butterfat is separated from milk or cream.
Always use the freshest buttermilk possible and include it only in basic soaps which are hard in consistency, as it tends to soften soaps considerably. Calendula flowers have a long history as skin softeners. They are very soothing to sensitive and dry skins and are excellent additions to facial soaps. Use the petals only, either fresh or dried, first removing them from the heads and discarding any seeds. Carrots are high in vitamin A and many other vitamins, and their essential oil also contains a good bit of vitamin E. Purchase bright orange, fresh carrots for use in soap.