pH of Facial Formulation and Adjustment

Regarding your formulation and its pH:

It's not possible to accurately predict the final pH of your complete formulation just by knowing the pH of some individual ingredients. The final pH depends on many factors, including the concentration of each ingredient, their interactions, and the buffering capacity of the mixture.

As the staff member mentioned, the most reliable way to determine the pH of your formula is to measure it directly once the formulation is complete.

For facial skincare products, a pH range typically between 4.5 and 5.5 is considered optimal as it aligns with the natural slightly acidic pH of healthy skin.

You asked where to adjust the pH if needed. If the measured pH of your final mixture is outside the desired range, the standard practice is to adjust it using small amounts of a pH adjuster (like a dilute solution of citric acid to lower pH or sodium hydroxide to raise pH) until the target pH is reached. You generally do not need to change the percentages of your main active ingredients or base components to adjust pH.

Based on the information provided:

• Apple Stem Cell Extract (PhytoCellTec™): pH ~7
• Pepha® - Tight: pH ~5
• (Oat)Beta Glucan: pH ~7
• Oils (Jojoba Oil, Shea Butter): Do not have pH.
• Information for Laureth-23, Phenxylethanol, Bisabolol, Rosemary Oleoresin Extract is not available from the provided text. You may need to check the specifications from their suppliers.

Once you have the final formulation, measuring the pH is the crucial step to ensure it is suitable for facial skin.