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 for the treatment 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 treatment of COVID: 144

Number of studies included in those reports: 3,456*

Number of participants included: 385,386*

*Note: numbers were not included in a number of the papers.








Research papers from 24 countries.
Most common ones:

China – 44 (33.3%)
India – 13 (9.8%)
Iran – 12 (9.1%)
Brazil – 10 (7.6%)
Italy – 6 (4.5%)







Most common NHPs include:

Patent herbal formulas: 45 (19.3%)
Vitamin D: 29 (12.4%)
Vitamin C: 23 (9.9%)
Zinc: 11 (4.7%)
Flavonoids: 9 (3.9%)
Probiotics: 8 (3.4%)
Turmeric: 7 (3.0%)
Polyphenols: 7 (3.0%)

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