I remember a recent study found that vitamin C had no effect on the period or severity of a cold but zinc did. Seems to be confirmed by this :- https://www.ncb

I remember a recent study found that vitamin C had no effect on the period or severity of a cold but zinc did. Seems to be confirmed by this :- https://www.ncbi.nlm.nih.gov/pubmed/15496046 https://www.ncbi.nlm.nih.gov/pubmed/15496046