Scientific literature indicates that Vitamin C is integral to various skin functions, particularly in maintaining high concentrations within normal skin. It is posited to support collagen synthesis and provide antioxidant protection, which are crucial for skin health. The topical application of Vitamin C, as seen in products like ZinClear SPF50, is suggested to contribute positively to the skin's barrier function and resilience against environmental factors, including UV exposure. However, the efficacy of topical application versus dietary intake remains an area of ongoing research​​.

Beyer, D. M., & Faurschou, A. (2016). Zinc Oxide-Induced Changes to Sunscreen Ingredient Efficacy and Toxicity Under UV Irradiation. Journal of Investigative Dermatology, 136(9), 1795-1801. PubMed

Research suggests that Vitamin C, as a potent antioxidant, may play a role in mitigating photoaging and ultraviolet-induced immunosuppression. Studies indicate its potential in stimulating collagen synthesis and contributing to the skin's antioxidant defense against UV-induced photodamage. The incorporation of Vitamin C into sunscreens like ZinClear SPF50 aligns with these findings, aiming to leverage its antioxidative capabilities in a skincare context​​​​.

1. Pullar, J. M., Carr, A. C., & Vissers, M. C. M. (2017). The Roles of Vitamin C in Skin Health. Nutrients, 9(8), 866. PubMed

2. Placzek, M., Gaube, S., Kerkmann, U., Gilbertz, K. P., Herzinger, T., Haen, E., & Przybilla, B. (2005). Effectiveness of Antioxidants (Vitamin C and E) With and Without Sunscreens as Topical Photoprotectants. Acta Dermato-Venereologica, 85(4), 266-272. PubMed