Taking vitamin C for a cold is a common practice, but its effectiveness depends on when and how it is used. Generally, if you start taking vitamin C after symptoms appear, it does not significantly reduce the duration or severity of a cold. However, there are some cases where it may provide a modest benefit.
When Vitamin C Might Help:
Regular Supplementation – Studies suggest that taking vitamin C consistently (not just when sick) may slightly reduce the duration of colds, but not prevent them.
In Athletes or High-Physical-Stress Individuals – Those under extreme physical stress (e.g., marathon runners, skiers, soldiers) have shown a reduced risk of colds with regular vitamin C intake.
In Children – Some studies suggest that vitamin C may have a slightly stronger effect in children, shortening colds more than in adults.
Why It Doesn’t Work Well After Onset:
Once cold symptoms start, the body’s immune response is already in motion, and vitamin C does not appear to significantly alter the course of the illness. While it is still important for overall immunity, megadosing vitamin C after symptoms appear won’t provide a miracle cure.
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