Gel formula for whitening and oil control: Adding EDTA and Preservative for Stability

Question

I have developed a gel formula intended for skin brightening and oil control. I would like to request a review of my formula and ask for suggestions on how to improve its stability and safety. Based on previous feedback, I understand that adding Disodium EDTA and a preservative is recommended. Could you please confirm the appropriate usage percentage for these ingredients and explain their function in the formula?

MySkinRecipes Expert · Accepted Answer

Your gel formula for whitening and oil control looks good! Based on the previous staff recommendation, it is advisable to add two more ingredients for stability and safety:

Disodium EDTA (0.2%): This acts as a chelating agent, helping to bind metal ions that may be present in the water. This prevents these ions from interfering with the stability and effectiveness of your active ingredients, especially Ethyl Ascorbic Acid.
Preservative (0.5-1.0%): A preservative is crucial to prevent the growth of bacteria, mold, and yeast in your water-based formula. Without it, the product can become contaminated and unsafe to use.

To incorporate these ingredients while keeping the total percentage at 100%, you will need to reduce the amount of water accordingly. For example, if you add 0.2% Disodium EDTA and 0.8% preservative (total 1%), you would reduce the water from 79% to 78%.

With these additions, your formula should be more stable and safe for use.