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Schwartz J, Weiss ST. Relationship between dietary vitamin C intake and pulmonary function in the first National Health and Nutrition Examination Survey (NHANES I). Am J Clin Nutr. 1994;59(1):110-114. doi: 10.1093/ajcn/59.1.110.

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Mancebo SE, Wang SQ. Recognizing the impact of ambient air pollution on skin health. J Eur Acad Dermatol Venereol. 2015;29(12):2326-32. doi: 10.1111/jdv.13250.

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Carr AC, Vissers MC. Synthetic or food-derived vitamin C--are they equally bioavailable? Nutrients. 2013;5(11):4284-304. doi: 10.3390/nu5114284.

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Prochazkova D, Bousiva I, Wihelmova N. Antioxidant and prooxidant properties of flavonoids. Fitoterapia. 2011;82(4):513-523. doi:10.1016/j.fitote.2011.01.018.

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Oregon State University. The Bioavailability of Different forms of Vitamin C (Ascorbic Acid). Linus Pauling Institute Micronutrient Information Center. Accessed April 14, 2021.

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