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Research has established that Vitamin C, in the proper form, can restore a smooth surface and a youthful glow to aging skin. In order to achieve these benefits, studies at Duke University show that a formulation of Vitamin C must possess the following characteristics: - It must contain L-Ascorbic acid
- It must be at at acid pH
- It must contain a high concentration of L-Ascorbic acid.
- The L-ascorbic acid must be stable.
The only product to fit this criteria are SkinCeuticals serums: - CE Ferulic
- Serum 10
- Serum 15
- Serum 20
- C+AHA
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