References: Cold / Flu / Covid
https://www.nature.com/articles/s41415-020-2476-8
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc7482897/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc7904017/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc8193024/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc7266767/
https://onlinelibrary.wiley.com/doi/10.1002/jmv.26514
https://www.sciencedirect.com/science/article/abs/pii/s096007602030296x
https://nutritionj.biomedcentral.com/articles/10.1186/s12937-021-00727-z
https://pubmed.ncbi.nlm.nih.gov/30675873/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc3166406/
https://pubmed.ncbi.nlm.nih.gov/10543583/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc3659258/
https://www.mdpi.com/2072-6643/11/4/708
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc7172861/
https://pubmed.ncbi.nlm.nih.gov/9701160/
https://pubmed.ncbi.nlm.nih.gov/32319538/
https://pubmed.ncbi.nlm.nih.gov/34368933/
https://pubmed.ncbi.nlm.nih.gov/33572045/
https://pubmed.ncbi.nlm.nih.gov/32754164/
https://www.nhs.uk/conditions/common-cold/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc6057395/
https://www.cochrane.org/cd000980/ari_vitamin-c-for-preventing-and-treating-the-common-cold
https://www.cochrane.org/cd006895/ari_can-probiotics-live-micro-organisms-prevent-upper-respiratory-tract-infections-such-common-cold
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc7718055/
https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.cd001364.pub4/full
https://pubmed.ncbi.nlm.nih.gov/23440782/
https://www.bmj.com/content/356/bmj.i6583
https://news.harvard.edu/gazette/story/2017/02/study-confirms-vitamin-d-protects-against-cold-and-flu/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc6379634/
https://gh.bmj.com/content/6/1/e003176
https://pubmed.ncbi.nlm.nih.gov/20200983/
https://www.leedsth.nhs.uk/assets/4ff9c0edea/diet-and-lifestyle-to-support-immune-function-v2.pdf
https://pubmed.ncbi.nlm.nih.gov/9863072/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc7696052/
https://academic.oup.com/jn/article/133/5/1457s/4558526?
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc3723386/
https://pubmed.ncbi.nlm.nih.gov/37079168/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc4288282/
https://www.jogh.org/documents/issue202001/jogh-10-010332.pdf
https://madeinheene.hee.nhs.uk/Portals/13/5%20Salisbury%20Hospital%20COVID-19%20Mouth%20Care%20Recommendations%20-%20V1_3.docx
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc7482897/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc7904017/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc8193024/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc7266767/
https://onlinelibrary.wiley.com/doi/10.1002/jmv.26514
https://www.sciencedirect.com/science/article/abs/pii/s096007602030296x
https://nutritionj.biomedcentral.com/articles/10.1186/s12937-021-00727-z
https://pubmed.ncbi.nlm.nih.gov/30675873/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc3166406/
https://pubmed.ncbi.nlm.nih.gov/10543583/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc3659258/
https://www.mdpi.com/2072-6643/11/4/708
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc7172861/
https://pubmed.ncbi.nlm.nih.gov/9701160/
https://pubmed.ncbi.nlm.nih.gov/32319538/
https://pubmed.ncbi.nlm.nih.gov/34368933/
https://pubmed.ncbi.nlm.nih.gov/33572045/
https://pubmed.ncbi.nlm.nih.gov/32754164/
https://www.nhs.uk/conditions/common-cold/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc6057395/
https://www.cochrane.org/cd000980/ari_vitamin-c-for-preventing-and-treating-the-common-cold
https://www.cochrane.org/cd006895/ari_can-probiotics-live-micro-organisms-prevent-upper-respiratory-tract-infections-such-common-cold
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc7718055/
https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.cd001364.pub4/full
https://pubmed.ncbi.nlm.nih.gov/23440782/
https://www.bmj.com/content/356/bmj.i6583
https://news.harvard.edu/gazette/story/2017/02/study-confirms-vitamin-d-protects-against-cold-and-flu/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc6379634/
https://gh.bmj.com/content/6/1/e003176
https://pubmed.ncbi.nlm.nih.gov/20200983/
https://www.leedsth.nhs.uk/assets/4ff9c0edea/diet-and-lifestyle-to-support-immune-function-v2.pdf
https://pubmed.ncbi.nlm.nih.gov/9863072/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc7696052/
https://academic.oup.com/jn/article/133/5/1457s/4558526?
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc3723386/
https://pubmed.ncbi.nlm.nih.gov/37079168/
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc4288282/
https://www.jogh.org/documents/issue202001/jogh-10-010332.pdf
https://madeinheene.hee.nhs.uk/Portals/13/5%20Salisbury%20Hospital%20COVID-19%20Mouth%20Care%20Recommendations%20-%20V1_3.docx