EDTA Compatibility and Color Stability

Based on the ingredients you've listed and their properties:

EDTA (Disodium EDTA) acts as a chelating agent, binding to metal ions that can cause instability and color changes in cosmetic formulations.

1. Effect on Z-White™ and other ingredients: Adding EDTA is generally beneficial for overall formula stability. While Z-White™ (Zinc Glycinate) contains zinc, EDTA's role is to chelate other trace metal ions present in the water or raw materials, preventing them from interfering with sensitive ingredients. The information available does not suggest that EDTA negatively impacts Z-White™. In fact, EDTA helps protect ingredients sensitive to metal-catalyzed degradation. Sym-White™ (Phenylethyl Resorcinol) is explicitly mentioned as having improved stability with Disodium EDTA.
2. Other affected ingredients: From the provided descriptions, Sym-White™ (Phenylethyl Resorcinol) is the ingredient specifically noted to benefit from the addition of Disodium EDTA for enhanced stability.
3. Ingredients prone to color change without EDTA: Dipotassium Glycyrrhizate is known to be prone to oxidation, which can cause color change. It is recommended to use an antioxidant like ActiveProtec™ OX for its stability. Sym-White™ (Phenylethyl Resorcinol) also requires good stability measures, including the use of EDTA, and can be sensitive to certain other ingredients (like amino acids, urea, or proteins) which may cause yellowing or separation.

Therefore, including EDTA in your formula is a good practice for enhancing stability and preventing potential discoloration of sensitive ingredients like Sym-White™ and helping to mitigate issues with others like Dipotassium Glycyrrhizate.