pH and Suitability for Sensitive Skin of Formulations with Alpha Arbutin, Natural Extracts, and Azelaic Acid

I understand you're asking about the pH and potential strength for sensitive skin of your two formulations.

Based on the information you provided and my capabilities, I cannot calculate the exact pH of these complex mixtures or definitively say whether the second formulation would be too strong for sensitive skin. Determining the precise pH of a formulation requires laboratory testing, as it depends on the interaction of all ingredients at their specific concentrations. Similarly, assessing how a formulation will affect sensitive skin is highly individual and depends on many factors beyond the ingredients and percentages, including the specific sensitivities of the person using it.

The previous response from cosmeceutical7 provides a good qualitative assessment based on the known properties of some ingredients, noting that Alpha Arbutin and natural extracts are acidic, while Azelaic Acid can be slightly alkaline, making the final pH difficult to predict without testing. Their advice to check the pH and potentially start with a lower concentration of Azelaic Acid for sensitive skin is sound.

For an accurate pH measurement and a reliable assessment of how the formulations might affect sensitive skin, laboratory testing and potentially patch testing are recommended.