Up to 45% less risk was associated with taking vitamin C prophylactically (RR 0.55 (95% CI, 0.31, 0.99; p = 0.048), in men with plasma vitamin C concentrations less than 45 μmol/L, however the number of colds reported collectively did not reach statistical significance between groups [ 27 ].
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Select Dietary Supplement Ingredients for Preserving and Protecting the Immune System in Healthy Individuals: A Systematic Review.
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