Formulation Advice for Adding Vitamin C, E, and Ferulic Acid to Your Cream

Based on your question and the ingredients in your existing cream base (Vitamin B3, N-Acetyl-D Glucosamine, Aloe Vera, Vitamin B6, Vitamin E), directly adding L-ascorbic acid, Vitamin E, and Ferulic Acid as you described is not recommended due to significant stability and compatibility challenges.

Here's why:

• L-Ascorbic Acid Stability: L-ascorbic acid (Vitamin C) is highly unstable, especially when dissolved in water and mixed with other ingredients. It requires a very specific, low pH environment (ideally 2.0-4.0) to remain stable and effective. Your existing cream base contains ingredients like Vitamin B3, N-Acetyl-D Glucosamine, and Vitamin B6, which are typically stable at higher pH ranges (around 3-8). Introducing 15% L-ascorbic acid would drastically lower the pH, potentially destabilizing the ingredients already in your cream and reducing their effectiveness. This low pH could also cause skin irritation.
• Ferulic Acid Solubility: Ferulic Acid is not water-soluble and requires a solvent like Ethoxydiglycol. As noted previously, 1% Ethoxydiglycol is likely insufficient to fully dissolve 1% Ferulic Acid. You would need a higher concentration of Ethoxydiglycol, but its usage rate in cosmetic formulas is limited by regulations.
• Ingredient Compatibility: Mixing these active ingredients into a pre-existing, potentially complex cream base can lead to unpredictable interactions, affecting the stability, efficacy, and safety of the final product.

To achieve a stable and effective formula containing L-ascorbic acid, Vitamin E, and Ferulic Acid, it is best to use a specially developed base or a pre-formulated product designed for this combination. The Vitamin C E Ferulic kit is an example of a system specifically formulated to stabilize L-ascorbic acid with Vitamin E and Ferulic Acid.

Attempting to add these sensitive ingredients to a general cream base is likely to result in rapid degradation of the Vitamin C, rendering the product ineffective.

Therefore, instead of trying to modify your existing cream, consider using a separate, stable serum or product that already contains a properly formulated blend of Vitamin C (L-ascorbic acid), Vitamin E, and Ferulic Acid.