354
Participants
Start Date
July 2, 2025
Primary Completion Date
December 31, 2025
Study Completion Date
August 31, 2027
Vitamin C (Ascorbic Acid)
Participants swallow synthetic vitamin C tablets 500mg with water, twice a day.
Vitamin C (Ascorbic Acid)
Participants swallow naturral vitamin C tablets 500mg with water, twice a day.
Placebo
Participants swallow tablets with the same texture, flavor, and appearance as the experimental group 500mg with water, twice a day.
Peking University Third Hospital
OTHER