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For example, L-ascorbic acid, a form of vitamin C found in many skin care products, degrades when it is exposed to heat, a high pH or sunlight, she said which can happen during transit and storage. And then theres the question of sufficient penetration into the skin barrier to allow Vitamin C to do what it needs to do to truly promote your skin health

While these results were not statistically significant, researchers say the small sample size in this study could have skewed those results

Photoaging is caused not only by increased degradation of collagen by various MMPs, serine and other proteases but also by decreased collagen production by fibroblasts (1)