Combining Ethyl Ascorbic Acid and Sodium Ascorbyl Phosphate

Yes, it is technically possible to use Ethyl Ascorbic Acid and Sodium Ascorbyl Phosphate together in a formulation.

However, as previously mentioned, combining ingredients from the same group with similar mechanisms of action, like these two Vitamin C derivatives, is unlikely to provide significantly enhanced benefits compared to using one effectively at its optimal concentration.

The most critical factor when considering combining these two is the pH level of the final formulation. Each ingredient has a specific pH range where it is most stable and effective:

• Ethyl Ascorbic Acid: Optimal pH range is 3.5-6.0.
• Sodium Ascorbyl Phosphate: Optimal pH range is 7-9.

These ranges are quite different. To create a stable and effective formula containing both, you would need to find a pH level that allows both ingredients to function reasonably well, which can be challenging and might compromise the efficacy or stability of one or both.

Therefore, while possible, it is generally more effective and simpler to formulate with one Vitamin C derivative at its optimal conditions rather than trying to combine multiple with conflicting requirements.