# References

Carr AC, Maggini S. Vitamin C and immune function. Nutrients. 2017;9(11):1211. doi:10.3390/nu911211.

[Read more](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5707683/)

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.

[Read more](https://pubmed.ncbi.nlm.nih.gov/8279390/)

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.

[Read more](https://pubmed.ncbi.nlm.nih.gov/26289769/)

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

[Read more](https://pubmed.ncbi.nlm.nih.gov/24169506/)

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.

[Read more](https://pubmed.ncbi.nlm.nih.gov/21277359/)

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

[Read more](https://lpi.oregonstate.edu/mic/vitamins/vitamin-C/supplemental-forms)