Adjusting pH of Stabilized Vitamin C (Natural-C Glycol™)

Regarding the adjustment of pH for Stabilized Vitamin C (Natural-C Glycol™) to meet FDA requirements (pH 3.5 or higher) while maintaining stability, the product description provides specific guidance.

This product is primarily intended for use as a finished product and is suitable for direct FDA registration and sale. The manufacturer explicitly states that it is not suitable for mixing any additional ingredients, as this may affect the stability of the vitamin C. The only exceptions mentioned are adding perfume (not exceeding 1%) and coloring.

Therefore, adding pH adjusters to increase the pH is not recommended by the manufacturer, and they cannot guarantee the stability of the product if additional ingredients are mixed in. If you still wish to modify the formulation by adding ingredients to adjust the pH, it is strongly advised to contact the company's R&D team first for guidance and to understand the potential impact on stability.