Buttermilk powder is a wonderful addition to soap as it is soothing and moisturising. Include it in MP Soap, CP Soap, Bath Bombs & Fizzies, Bath & Foot Soaks, Bath Milks , Bath Salts, Spa Tablets and other bath formulations.Buttermilk powder can be mixed with other milk powders, cornflour, powdered herbs, oatmeal - in fact just about everything. Buttermilk works superbly in our Cucumber, Shea and Buttermilk Soap Recipe.