A systematic review on the effects of Echinacea supplementation on cytokine levels: Is there a role in COVID-19?
Metabol Open. 2021 Sep;11:100115. doi: 10.1016/j.metop.2021.100115. Epub 2021 Jul 29.
Metabol Open. 2021.
PMID: 34341776
Free PMC article.