To superfat soap is to leave unsaponified oils in the final bars for the mildest soap. Unsaponified oils do not form compounds with the other soapmaking components but, instead, remain in their original form in the bar as emollient ingredients.

The percentage of sodium hydroxide in a soap formula is carefully calculated according to the degree of saponification desired. (Remember, saponification is the process whereby the oil molecules and sodium hydroxides molecules mix to form the new substance — soap.) When enough sodium hydroxide is used to supply all of the fatty acids with sodium hydroxide mates, the soap is considered fully saponified. No discount is taken from the percentage of sodium hydroxide required for complete saponification. This fully saponified soap does not contain excess oils. By using less sodium hydroxide than is required for a complete saponification, however, fat and oil molecules run out of lye mates. The excess oil remains in the final bar of soap as a soothing moisturizer. This milder soap is called a superfatted soap — a soap provided with excess fat and oil to make it more moisturizing.

Nearly all bath soaps clean, but the degree of saponification determines how gently or how harshly they do their jobs. An excess of sodium hydroxide not only can strip the skin of dirt and excess oils, but it can take away important natural oils as well. People with dry skin are especially affected by the strip-clean. When emollient fats and oils are added to soap as superfatting ingredients, they lay a hydrophobic film on the skin’s surface that softens the skin by holding in internal moisture.

So by superfatting our goat milk soap, we are providing our skin with a milder, gentler, and more moisturizing skin-care experience!