Cica Sleeping Mask Base and Adding Water-Soluble Ingredients

Thank you for your question regarding the Cica Sleeping Mask Base and adding water-soluble ingredients.

While the Cica Sleeping Mask Base is formulated to be preservative-free as is, adding external ingredients, especially water-soluble ones, can significantly change the formula's composition. Adding water-soluble ingredients often introduces additional water or dilutes the existing system, creating a more favorable environment for microbial growth such as bacteria, yeast, and mold.

The antioxidants present in the base are included to help maintain the stability and quality of the active ingredients you add, protecting them from oxidation. However, these antioxidants do not function as broad-spectrum preservatives to prevent microbial contamination of the entire formula.

Therefore, when you customize the Cica Sleeping Mask Base by adding water-soluble ingredients, it is highly recommended and generally necessary to include a suitable broad-spectrum preservative in your final formulation. This will ensure the safety, stability, and appropriate shelf life of your finished product.