In a Thai study, the medicinal plants most used for the treatment of COVID-19 were Psidium guajava L., followed by Phyllanthus emblica L., Houttuynia cordata Thunb., P. major L., and Strobilanthes cusia (Nees) Kuntze 14.
In a study conducted in Peru during COVID-19, Eucalyptus globulus Labill. was the most commonly used medicinal plant, followed by Z. officinale Roscoe, A. sativum L., Piper aduncum L., M. recutita L., and Erythroxylum coca Lam 5. In a Thai study, the medicinal plants most used for the treatment of COVID-19 were Psidium guajava L., followed by Phyllanthus emblica L., Houttuynia cordata Thunb., P. major L., and Strobilanthes cusia (Nees) Kuntze 14.