Study aim: Investigating the effect of Nutrition Bio-shield (NBS) herbal powder on the mortality rate of patients infected with the Covid-19 virus Design: Clinical trial with control group, parallel groups, double-blind, randomized, phase 3 on 400 patients. The RAND function of Excel software was used for randomization. Settings and conduct: In the present study, patients, researchers, nurses and statisticians do not know about the grouping of patients who receive the NBS powder. This clinical trial will be conducted in the Farabi Hospital in Mashhad. Patients in the intervention group (200 people), in addition to receiving the routine treatment adopted by the attending physician based on the guidelines, will also receive the NBS powder for 14 days. The control group (200 people) will also receive the same treatment panel along with placebo for 14 days. Before and after the intervention, the demographic and laboratory parameters considered in this study are collected from the patients and recorded in the file. Finally, the results will be analyzed with the help of significant statistical methods. Participants/Inclusion and exclusion criteria: In this study, patients over 20 years old whose infection with the covid-19 virus was confirmed by a specialist with clinical symptoms, computerized tomography scan and molecular methods were included in the study. On the other hand, suffering from underlying and autoimmune diseases as well as the use of immunosuppressive drugs by patients are the main criteria for not entering the study. Intervention groups: In the intervention group, NBS powder will be prescribed 4.5 grams daily in 3 doses of 1.5 grams for 14 days along with the main treatment. The control group will receive a placebo in addition to the main treatment panel. Main outcome variables: Duration of infection ; Mortality rate of patients ; Count of white blood cells ; Hospitalization period