Using Zinc PCA with Vitamin C E Ferulic

Based on the previous staff recommendation, one way to use Zinc PCA with Vitamin C E Ferulic is to add Zinc PCA directly into your Vitamin C E Ferulic formula at a concentration of 0.5-1%.

However, it's worth noting that Zinc PCA is optimally soluble and effective in formulas with a pH between 4-6, while Vitamin C (Ascorbic Acid) formulas like Vitamin C E Ferulic are typically formulated at a lower pH (often below 3.5) for stability and skin penetration. Adding Zinc PCA to a low pH formula might potentially affect the stability or efficacy of one or both ingredients, or cause precipitation. While the staff suggestion is a direct method, consider testing stability if you choose this route.

Regarding your specific aloe gel formulation containing 1% Zinc PCA and other ingredients:

This formula can certainly be used as a beneficial skincare step on its own, providing the oil control and wound healing benefits of Zinc PCA, as well as the properties of the other ingredients like Aloe Vera, Vitamin B5, and various extracts.

Applying this aloe gel before your Vitamin C E Ferulic in the morning is unlikely to significantly increase the absorption of the Vitamin C. Vitamin C absorption is primarily determined by its form (Ascorbic Acid is highly absorbable), concentration, and the pH of the Vitamin C formula itself. Applying another layer beforehand might even slightly hinder absorption or cause interactions.

A better approach might be to use the aloe gel formula containing Zinc PCA at a different time of day (e.g., in your evening routine) or on alternate days from your Vitamin C E Ferulic to ensure you receive the full benefits of both products without potential interference.

If you still prefer to layer them in the morning, it's generally recommended to wait a few minutes (typically 1-5 minutes) after applying the first product to allow it to absorb before applying the next. However, be mindful of the potential pH incompatibility mentioned earlier.