For best results, we recommend using your 20% Vitamin C + E Ferulic Acid Serum within 3 to 6 months of opening, when it is freshest and most effective. As the serum begins to age, it will slowly appear darker in color due to the natural oxidation process. For further guidance and customer consideration, the period after opening symbol is provided on the product box. Use upon receipt and refrigeration is suggested to assist with the shelf life of the product.

With the suggested daily use amount of 1-2 pumps, a 1oz bottle of 20% Vitamin C + E Ferulic Acid Serum typically lasts about 1 month.

We do not recommend applying the 20% Vitamin C + E Ferulic Acid Serum serum directly to the under-eye area. The skin around the eyes is very delicate, therefore, we recommend using products specifically formulated for eye area instead.