The goal of this living map of evidence is to act as a resource, attesting to the abundance and nature of the published peer-reviewed evidence being synthesized on natural health products (NHPs) for the prevention of COVID in the form of research reports that have used a systematic (and reproducible) strategy.

Statistical Overview – as of November 12, 2022

Numbers of research reports investigating the use of natural health products for the prevention of COVID: 65

Number of studies included in those reports: 1,983*

Number of participants included: 3,075,881*

*Note: numbers were not included in all papers.









22 countries included. Most common:

Iran – 12 (21%)
United Kingdom – 6 (11%)
China – 5 (9%)
India – 5 (9%)
Brazil – 4 (7%)
Italy – 4 (7%)









Most common NHPs include:

Vitamin A – 42 (29%)
Vitamin D – 42 (29%)
Zinc – 11 (8%)
Selenium – 10 (7%)

Search terms: systematic review, COVID, COVID-19, SARS-CoV-2, “Severe acute respiratory syndrome coronavirus 2″, “viral respiratory tract infections”, “naturopathic treatment”, “Traditional Chinese medicine”, nutraceutical, “natural product” botanical, herb, “herbal medicine”, “medicinal herbs”, “medicinal plants”, vitamin, mineral