IRCT20210515051304N1 IRCT 2021-11-18 Tehran University of Medical Sciences Effect of vitamin B12 on hospitalized covid-19 patients. Determining the effects of vitamin B12 on clinical outcome and complications of hospitalized covid-19 patients. 2021-10-04 anticipated 20 Complete https://irct.ir/trial/56294 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Single, Purpose: Treatment, Randomization description: bock randomization in order to balance the randomization and blindness, four block are randomized during the study. in each block, there are two groups and and as the group is completed, the first block will be opened and four patients will be assign according to the first block. then enter the second block until the sufficient sample, Blinding description: Patients and caregivers will not know whether the medication is a placebo or the drug. 3 covid-19. Intervention 1: Intervention group: B-12 vitamin 1000mg/daily, 7 days, oral. Intervention 2: Control group: Vitamin B-12 placebo with the same volume, frequency, number of days and the same manufacturer. Yes - There is a plan to make this available What will be shared: including criteria: Personal consent, Age between 18-75 years, Covid-19 positive and hospitalization. When: the start of access period is six months after results To whom: Dr. Neda Faraji Dr. Samaneh Akbarpour Dr. Nafiseh Sadat Alizadeh Conditions: Necessary conditions will be reviewed by the Research committee after the petition. Where to obtain: Refer to the Development and Research Center of Baharloo Hospital Research Unit. How to obtain: The letter is written to the Development Center and discussed to the Research Committee, which is given the necessary access after approval. Comments: