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

Numbers of research reports investigating the use of natural health products for the prevention of COVID: 31

Number of studies included in those reports: 1057*

Number of participants included: 1,883,395*

*Note: numbers were not included in all papers.









22 countries included. Most common:

Iran – 5 (16.1%)
United Kingdom – 3 (9.7%)
Australia – 2 (6.4%)
China – 2 (6.4%)
Italy – 2 (6.4%)
USA – 2 (6.4%)









Most common NHPs include:

Vitamin A – 27 (87.1%)
Vitamin D – 27 (87.1%)
Selenium – 6 (19.4%)
Zinc – 6 (19.4%)

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