Although your Vitamin C serum will lose its efficacy once oxidized, the product does not become harmful to the skin until it's expiration date, approximately one year after manufacturing. It’s important to differentiate between an expired product and a product that is no longer effective. Once it turns orange or brown it’s no longer an effective Vitamin C serum. As the serum begins to age it will slowly appear more yellow in color due to the natural oxidation process. When freshly manufactured, the 20% Vitamin C + E Ferulic Acid Serum will be a watery consistency and cloudy in appearance. Vitamin C in a skin care serum is even more likely to oxidize due to its acidic formulation. L-Ascorbic Acid (vitamin C in its natural form) is particularly unstable and decreases in efficiency from exposure to air, light and varied temperatures. The shelf life of serum depends on the various ingredients in it, but all serums have an expiration date. The Vitamin C in the Timeless serums is derived from L-Ascorbic Acid, one of the most effective forms of this active ingredient. Vitamin C is also an essential nutrient for our bodies and works to counteract aging that comes from free radical damage. Known as one of nature’s most powerful antioxidants, Vitamin C helps fight the damaging effects of the sun's rays and other environmental factors. An effective Vitamin C Serum is a great skincare product for maintaining healthy, glowing skin.
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