Editing Common cold (section)

===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 if taken on a regular basis.<ref name=Hem2013>{{cite journal |vauthors=Hemilä H, Chalker E |title=Vitamin C for preventing and treating the common cold |journal=The Cochrane Database of Systematic Reviews |volume=1 |issue=1 |pages=CD000980 |date=January 2013 |pmid=23440782 |pmc=1160577 |doi=10.1002/14651858.CD000980.pub4}}</ref> There is no conclusive evidence that [[vitamin D]] supplementation is efficacious in the prevention or treatment of respiratory tract infections.<ref>{{cite journal |vauthors=Bradley R, Schloss J, Brown D, Celis D, Finnell J, Hedo R, Honcharov V, Pantuso T, Peña H, Lauche R, Steel A |display-authors=6 |title=The effects of vitamin D on acute viral respiratory infections: A rapid review |journal=Advances in Integrative Medicine |volume=7 |issue=4 |pages=192–202 |date=December 2020 |pmid=32837896 |pmc=7397989 |doi=10.1016/j.aimed.2020.07.011}}</ref>