In a study that examined the relationship between antioxidants and coronary heart disease, subjects with a daily intake of 700 mg or more vitamin C had a lower risk of coronary heart disease.
Reference: Knekt P, Ritz J, Pereira MA, O’Reilly EJ, Augustsson K, et al. Antioxidant vitamins and coronary heart disease risk: a pooled analysis of 9 cohorts. Am J Clin Nutr. 2004;80(6):1508-1520.