Information Regarding Vitamin C Stability and Adding Stabilizers

Thank you for your questions regarding Vitamin C stability and adding stabilizers.

1. Regarding adding Protec™ OX and Protec™ UV to Vitamin C E Ferulic:
   Vitamin C (specifically Ascorbic Acid, which is used in Vitamin C E Ferulic) is prone to oxidation, which can cause it to turn yellow. Vitamin C E Ferulic is already formulated with Vitamin E and Ferulic Acid to help stabilize the Ascorbic Acid. While Protec™ OX and Protec™ UV are indeed ingredients designed to protect formulations from oxidation and UV degradation, adding raw materials like these to a finished cosmetic product is generally not recommended. Adding ingredients can disrupt the carefully balanced formula, potentially affecting its stability, texture, efficacy, and even its preservation system, which could lead to unexpected results or spoilage.

2. Availability of Vitamin C E Ferulic:
   Yes, Vitamin C E Ferulic is a product listed in our system (Product ID 70). Please check the website for current stock availability.

3. Adding Protec™ OX and Protec™ UV to a stabilized vitamin C formula:
   Similar to the first point, adding Protec™ OX or Protec™ UV (or their water-soluble counterparts ActiveProtec™ OX and ActiveProtec™ UV) is most appropriate when you are creating a cosmetic formula from scratch. These ingredients are effective stabilizers for Vitamin C and other sensitive ingredients when incorporated correctly during the formulation process. However, adding them to an already finished, stabilized vitamin C product that you purchased is generally not advisable for the reasons mentioned above (potential formula disruption).

If you are interested in formulating your own stable Vitamin C serum, Protec™ OX (oil-soluble antioxidant), Protec™ UV (oil-soluble UV absorber), ActiveProtec™ OX (water-soluble antioxidant), and ActiveProtec™ UV (water-soluble UV absorber) are ingredients you could consider incorporating into your formulation, depending on the type of base you are using.

The yellowing you experienced with the Vitamin C E Ferulic product indicates that oxidation occurred, which can happen with Ascorbic Acid formulations despite the presence of stabilizers, as Ascorbic Acid is inherently unstable, especially when exposed to air, light, and heat over time.