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. 2016 Jul 25;5(1):1161. doi: 10.1186/s40064-016-2605-7

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 5 — Mean vitamin C concentration and percent changes in leukocytes over a 24-h period: a concentration change, Ester-C^® versus placebo; b concentration change, Ester-C^® versus ascorbic acid; c percent change, Ester-C^® versus placebo; d percent change, Ester-C^® versus ascorbic acid. Data are mean ± standard error. Significant differences are indicated: *P < 0.05, Ester-C^® versus placebo percent change (P = 0.042 at 8 h, P = 0.036 at 24 h); **P < 0.05, Ester-C^® versus ascorbic acid percent change (P = 0.028 at 8 h, P = 0.034 at 24 h); ^†P < 0.05, Ester-C^® within-group differences (concentration change P = 0.036 at 24 h; percent change P = 0.040, P = 0.013, and P = 0.001 at 4, 8, and 24 h, respectively)