A large British study of more than 5,000 adults aged 48 to 92 found that people with optimal blood vitamin C (50 µmol/L or higher) walked faster and stood from a chair more quickly than those with low levels. Women also had stronger height-adjusted grip, while men showed no grip link. Food-based vitamin C showed associations only in women, and not in a tidy pattern. The design is cross-sectional, so it can't prove vitamin C causes better function. Here's what the numbers show, what they don't, and why your blood level may be worth checking.
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