Here is a sample formulation for a 20% vitamin C face serum with ingredient quantities listed:

Ingredients:

• 14 mL water
• 4 mL glycerin
• 2 mL L-ascorbic acid (vitamin C)
• 0.6 mL propylene glycol
• 0.4 mL hyaluronic acid

Procedure:

1. In a clean and sterilized container, mix together the water and glycerin until well combined.
2. Add the L-ascorbic acid and mix until fully dissolved.
3. Add the propylene glycol and mix until well combined.
4. Add the hyaluronic acid and mix until fully dispersed.
5. Pour the mixture into a sterilized container and cap tightly.

Note: The quantities listed in this formulation are for a small batch of serum and can be adjusted as needed for larger batches. It is important to follow good manufacturing practices when making your own personal care products, including using accurate measuring tools and sterilized equipment and containers. Proper storage and handling of these products is also important to ensure their effectiveness and safety.

Disclaimer

While every effort has been made to reproduce these formulations correctly, the Publisher of this website cannot accept any liability for the information presented. All formulations are provided in good faith, but no warranty is given as to the accuracy of information or results, or suitability for a particular use, nor is freedom from patent infringement to be inferred. Continued use of this website infers acceptance of this disclaimer.