Lactic Acid (AHA) in Oil-Based Soap with High pH

The effectiveness of Lactic Acid as an AHA (Alpha Hydroxy Acid) with exfoliating properties is dependent on the acidity (low pH) of the solution.

When Lactic Acid is used in oil-based soap, which typically has a very high pH (between 8-12), the Lactic Acid will be neutralized, turning into a Lactate salt.

In the form of Lactate salt and at such a high pH, the AHA exfoliating property of Lactic Acid is significantly reduced or essentially lost.

While Lactate may still possess some other properties, such as acting as a humectant (moisturizer), it will not be able to function effectively as an AHA exfoliant in the high alkaline environment of oil-based soap.

Therefore, if Neutralized Lactic Acid is added to oil-based soap with a pH between 8-12, its effectiveness as an AHA exfoliant will be lost.