The regular and consistent use of a Vitamin C serum in your skin care will increase collagen production, brighten skin and boost your sun protection. However these benefits will only come by when you store the Vitamin C product product well.
Vitamin C serums are usually clear. Vitamin C is notoriously unstable, quickly degrading when exposed to air and light. This process when the serum changes color turning yellow and eventually brown is called oxidization. When Vitamin C oxidizes it changes to dehydroascorbic acid (DHAA), which then changes the color of your serum from that clear tone down to a deep brown/red based on the level of oxidation. If your serum has changed to a dark color I would suggest not using it. There is a high probability of skin irritation.
It is clear that L-Ascorbic Acid is the most effective form of Vitamin C. If your skin can tolerate it, there are a number of highly concentrated stabilized vitamin C products on the market. These products aren’t immune to oxidization and still require proper storage.
How to Store and Use your Vitamin C Serum For Longer
- Purchase formulas that are clear. Some companies dye their serums, darkening the color. Steer clear of such formulas as this could hide oxidation.
- Purchase well formulated products. Since Ascorbic Acid can begin to oxide/degrade as soon as it’s dissolved in water, look for products where water is NOT one of the first ingredients. It’s likely that such a product will really work. That means look for serums instead of cream based products. If water is present, look for products that use stabilizing ingredients.
- Proper packaging. Purchase formulas that come in dark colored bottles with air restrictors or pump packaging. Store them in a cool dark place, like the refrigerator.
- Reseal tightly after use/application.