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| Name | Current message text |
|---|---|
| h English (en) | ===Vitamins C and D=== {{Main|Vitamin C and the common cold}} {{Main|Vitamin D and respiratory tract infections}} [[Vitamin C]] [[dietary supplement|supplementation]] does not affect the incidence of the common cold, but may reduce its duration. There is no conclusive evidence that [[vitamin D]] supplementation is efficacious in the prevention or treatment of respiratory tract infections. |