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That can introduce variability such as: Mislabeling Contamination Inconsistent dosing Unknown impurities Side effects: what we can responsibly say Because robust human safety data are limited, it's hard to give a definitive side-effect profile with meaningful incidence rates
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A benefit of regular vitamin C supplementation was also seen in the duration of colds, with a greater benefit in children than in adults: The pooled effect of vitamin C supplementation was a 14% reduction in cold duration in children and an 8% reduction in adults
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