Subject: pH Adjustment in Facial Wash Gel

Hello,

Thank you for your question regarding adjusting the pH of your facial wash gel containing Lauryl Glucoside.

It is indeed challenging to provide an exact percentage of citric acid needed to reach a pH of 5-6 without knowing the full formulation, especially the concentration of Lauryl Glucoside and other ingredients. As the staff member mentioned, Lauryl Glucoside is quite alkaline, and the amount of acid required will depend significantly on how much is used in your 100g batch.

Instead of a fixed percentage, the standard method for pH adjustment in cosmetic formulations is to add a diluted solution of the acid (like citric acid) gradually while continuously stirring the product and measuring the pH with a reliable pH meter or indicator strips.

Here's a general approach:

1. Prepare a diluted solution of citric acid (e.g., 10% or 20% in water).
2. Add the citric acid solution drop by drop or in small increments to your 100g gel formulation.
3. Stir thoroughly after each addition to ensure the acid is evenly distributed.
4. Measure the pH after stirring.
5. Repeat steps 2-4 until the desired pH range of 5-6 is achieved.

This method allows you to control the pH precisely and avoid overshooting the target range. Starting with a diluted acid solution gives you better control than adding the solid acid directly.

While we cannot give you a specific percentage, following this gradual adjustment method is the most reliable way to achieve the desired pH for your formulation.

We hope this guidance is helpful!