Cosmetic Formulation Analysis: Ingredient Compatibility, Mixing, and pH Adjustment

Question

I have a cosmetic formulation with the following ingredients and percentages (exact list was provided in the original question but is not available here, including Azelaic Acid and Tea Tree Oil 2%). I would like to ask for an analysis regarding:

Ingredient compatibility
Mixing procedure
Proportion adjustment

Please advise on any potential issues, the correct mixing method, and if the proportions are suitable. Specifically, I am concerned about the compatibility and stability of the ingredients and the overall effectiveness of the formula.

MySkinRecipes Expert · Accepted Answer

Regarding your formulation analysis request:

Based on the ingredients and percentages provided:

Ingredient Compatibility: The ingredients are compatible. However, please note that Tea Tree Oil (2%) can cause skin irritation, especially for sensitive skin. If you have sensitive skin, it is recommended to avoid using Tea Tree Oil in this formulation.
Mixing Procedure: The ingredients can be mixed together simply by stirring until fully combined. No complex steps are required.
Proportion Adjustment: The provided percentages add up to 100% and seem reasonable as a starting point. However, due to the slightly high pH range of Azelaic Acid (around 7-8), it is strongly recommended to measure the pH of the final mixture after combining all ingredients. If the pH is higher than 7, you should adjust it down to the range of 4-7 by adding a mild acid, such as Glycolic Acid, drop by drop, stirring, and re-measuring until the desired pH is reached. This pH range is more suitable for skin application.

Relevant Product IDs: 357, 162, 1221, 224, 210, 74, 660