Adding Witch Hazel to Vitamin C E Ferulic Formula

Regarding your question about adding Witch Hazel to the Vitamin C E Ferulic formula, it is generally not recommended.

The Vitamin C E Ferulic formula is specifically designed to stabilize L-ascorbic acid, which is a highly effective but unstable form of Vitamin C. Modifying this formula by adding other ingredients, such as Witch Hazel, can disrupt the delicate balance and negatively impact the stability and effectiveness of the Vitamin C.

The staff's reply also confirms that the Vitamin C E Ferulic formula should not be altered, except for adding fragrance, precisely because any changes to the composition can affect the stability of the Vitamin C.

Therefore, to maintain the intended efficacy and stability of the Vitamin C E Ferulic serum, it is best to avoid adding Witch Hazel or other ingredients to the pre-formulated product.