All Studies

The effect of propolis plus Hyoscyamus niger L. methanolic extract on clinical symptoms in patients with acute respiratory syndrome suspected to COVID-19: A clinical trial.

A study found that a syrup with propolis and Hyoscyamus niger L. extract reduced COVID-19 symptoms like cough, shortness of breath, and sore throat, but not nausea and vomiting.

Kosari M et al (2021).
Phytother Res.
PubMed:
33860587