Vitamin c side effects on skin
Pro Research Analysisby 
Searched over 200M research papers
Vitamin C Side Effects on Skin
Introduction to Vitamin C and Skin Health
Vitamin C, also known as ascorbic acid, is a crucial nutrient for maintaining skin health. It plays multiple roles, including promoting keratinocyte differentiation, decreasing melanin synthesis, and providing antioxidant protection against UV-induced photodamage . However, while vitamin C is beneficial, it is essential to understand its potential side effects on the skin.
Antioxidative and Photoprotective Effects
Vitamin C is one of the most powerful antioxidants in the skin, protecting against photoaging, ultraviolet-induced immunosuppression, and photocarcinogenesis . It works synergistically with vitamin E to protect against oxidative damage, making it a vital component in skincare for its antioxidative and photoprotective properties . Despite these benefits, the challenge lies in finding stable and permeable formulations for topical application to achieve optimal results .
Antiaging and Antipigmentary Effects
Vitamin C increases collagen synthesis, stabilizes collagen fibers, and decreases collagen degradation, contributing to its antiaging effects . It also reduces melanin formation, thereby decreasing pigmentation and preventing hyperpigmentation of the skin Al‐Niaimi2017Sugiura2018. These properties make vitamin C a popular ingredient in antiaging and antipigmentary skincare products.
Potential Adverse Effects
While vitamin C is generally considered safe with few adverse side effects, some potential issues have been noted. High doses of vitamin C can reduce cancer cell viability and invasiveness, and induce apoptosis in human malignant melanoma, suggesting a therapeutic potential but also indicating that excessive use might have complex effects on skin cells . Additionally, oral supplementation of vitamin C has shown mixed results in reducing oxidative stress markers in human skin following UV exposure, with some studies indicating a reduction in skin malonaldehyde content but also a decrease in total glutathione and protein thiols . This paradoxical effect suggests that vitamin C might replace other reductants in skin cells, potentially altering the skin's overall reductant capacity .
Conclusion
Vitamin C is a vital nutrient for skin health, offering antioxidative, photoprotective, antiaging, and antipigmentary benefits. However, while generally safe, high doses and certain formulations may have complex effects on skin cells and oxidative stress markers. Further research is needed to fully understand these effects and optimize the use of vitamin C in skincare.
Sources and full results
Most relevant research papers on this topic