Stabilized Vitamin C (Natural-C Glycol™) Serum Usage

Regarding your questions about the Stabilized Vitamin C (Natural-C Glycol™) Serum:

1. Does it need mixing? This product is formulated to be used as a finished serum (100% usage rate) and is not intended to be mixed with additional ingredients, except for minor additions like fragrance (up to 1%) or coloring. Adding other ingredients can affect the stability of the vitamin C. While the product has a low pH (2-3), which is optimal for L-Ascorbic Acid stability and efficacy, it is designed for direct application. The mention of pH 3.5+ in the description refers to general FDA regulations for finished cosmetic products sold to consumers, but this specific serum is formulated for direct use as is.

2. What should be added if mixing is needed? As mentioned above, this product is not suitable for mixing with additional ingredients due to stability concerns. Therefore, there are no ingredients recommended to be added.

Based on other user experiences, the serum can be applied directly without mixing. However, due to the low pH and high concentration of Vitamin C, it is always recommended to perform a patch test first, especially if you have sensitive skin or are new to using acidic products, as it may cause irritation.

The serum can be used both during the day and night.