Simple Vitamin C Serum Mixing Instructions

Here is a simple method to mix your Vitamin C serum formula:

Formula:

• Vitamin C (L-ascorbic acid) (Ultra-Fine): 15%
• Water: 83%
• Xanthan Gum (clear gel type, smooth texture): 1%
• Mild Preserved Eco™: 1%

Mixing Steps:

1. Weigh out the required amount of Water (83%).
2. Slowly add the Xanthan Gum (1%) to the water while stirring or blending at high speed. Continue mixing until a smooth, clear gel is formed.
3. Add the Mild Preserved Eco™ (1%) to the gel base and mix thoroughly until it is fully dissolved and the mixture is clear.
4. Ensure the temperature of the mixture is below 30°C.
5. Add the Vitamin C (L-ascorbic acid) (Ultra-Fine) (15%) to the gel base. Mix gently until the powder is completely dissolved.
6. Check the pH of the finished serum. For optimal stability and effectiveness of L-ascorbic acid, and to meet FDA requirements for leave-on products, the pH should be between 3.5 and 4.0. Adjust with a suitable pH adjuster if necessary.
7. Pour the serum into a clean, airtight container.

Important Notes:

• L-ascorbic acid is most stable at a low pH (2.0-4.0), but for skin application, a pH of 3.5-4.0 is generally recommended and required by FDA regulations.
• L-ascorbic acid in water-based solutions is prone to oxidation, which reduces its effectiveness. Storing the finished serum in the refrigerator (6-8°C) will help extend its shelf life.
• Observe the serum for changes in color (turning yellow or orange indicates oxidation) and discard if this occurs.

This method provides a basic water-based serum. For enhanced stability and skin feel, formulators often include ingredients like glycols or ferulic acid, but this simple method follows your requested formula.