{Reference Type}: Journal Article {Title}: A review on the effective natural compounds of medicinal plants on the COVID-19. {Author}: Ketebchi S;Papari Moghadamfard M; {Journal}: Nat Prod Res {Volume}: 0 {Issue}: 0 {Year}: 2024 Feb 9 {Factor}: 2.488 {DOI}: 10.1080/14786419.2024.2309322 {Abstract}: In this review out of 300 selected articles 70 articles were evaluated, and the most significant compounds impacting COVID-19 and their mechanism of action were introduced. The compounds belong to four categories as follow: Phenolic, Flavonoid, Terpenoid, and Alkaloid compounds. In the phenol groups, the most effective compounds are scutellarin (suppressor of COVID-19 virus), thymol and carvacrol (the most inhibitory effect on COVID-19 virus), in the flavonoid groups, hesperdin (a strong inhibitor on COVID-19), in the terpenoids, methyl tanshinonate and sojil COVID-19 inhibitory effect) and 1,8-cineol (COVID-19 inhibitory effect) and in the last group, niglidine and quinoline alkaloid compounds (COVID-19 inhibitory effect) have been identified and introduced. These compounds have shown promising results due to their structure and effective mechanisms on COVID-19, so it can be an idea for researchers in this field to try to produce drugs by using natural compounds against the COVID-19 and Corona viruses.