← Register
Vitamins
Vitamin C
In plain language
A classic antioxidant vitamin. Widely believed to prevent colds - the actual evidence is much more modest than the reputation.
Is it an approved medication?
No — not an approved medication
No - sold as a food supplement, not a medication
How strong is the evidence?
Weak to moderate - does not prevent colds, may modestly shorten them if taken regularly (not just when you are already sick)
The main thing to know
Taking it AFTER you already have a cold does little; only regular daily use shows a (small) benefit.
Mechanism
Water-soluble antioxidant; cofactor for collagen synthesis and immune cell function.
Potential benefits
- Marginal reduction in common cold duration
- Antioxidant support
- Enhances non-heme iron absorption
Regulatory status
Dietary supplement, widely approved