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Six-Year Effect of Combined Vitamin C and E Supplementation on Atherosclerotic Progression *

Background— Self-selected supplementation of vitamin E has been associated with reduced coronary events and atherosclerotic progression, but the evidence from clinical trials is controversial. In the first 3 years of the ASAP trial, the supplementation with 136 IU of vitamin E plus 250 mg of slow-release vitamin C twice daily slowed down the progression of carotid atherosclerosis in men but not women. This article examines the 6-year effect of supplementation on common carotid artery (CCA) intima-media thickness (IMT).

Methods and Results— The subjects were 520 smoking and nonsmoking men and postmenopausal women aged 45 to 69 years with serum cholesterol >=5.0 mmol/L (193 mg/dL), 440 (84.6%) of whom completed the study. Atherosclerotic progression was assessed ultrasonographically. In covariance analysis in both sexes, supplementation reduced the main study outcome, the slope of mean CCA-IMT, by 26% (95% CI, 5 to 46, P=0.014), in men by 33% (95% CI, 4 to 62, P=0.024) and in women by 14% (not significant). In both sexes combined, the average annual increase of the mean CCA-IMT was 0.014 mm in the unsupplemented and 0.010 mm in the supplemented group (25% treatment effect, 95% CI, 2 to 49, P=0.034). In men, this treatment effect was 37% (95 CI, 4 to 69, P=0.028). The effect was larger in subjects with either low baseline plasma vitamin C levels or CCA plaques. Vitamin E had no effect on HDL cholesterol.

Conclusions— These data replicate our 3-year findings confirming that the supplementation with combination of vitamin E and slow-release vitamin C slows down atherosclerotic progression in hypercholesterolemic persons.

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Published on 03-02-2009
Authors: Riitta M. Salonen, MD, PhD; Kristiina Nyyssonen, PhD; Jari Kaikkonen, PhD; Elina Porkkala-Sarataho, PhD; Sari Voutilainen, PhD, RD; Tiina H. Rissanen, MScPH, RD; Tomi-Pekka Tuomainen, MD; Veli-Pekka Valkonen, MD; Ulla Ristonmaa, MSc; Hanna-Maaria Lakka, MD, PhD; Meri Vanharanta, PhD, MPH; Jukka T. Salonen, MD, PhD; Henrik E. Poulsen, MD, PhD
Source: Published online before print February 3, 2003, doi: 10.1161/01.CIR.0000050626.25057.51